1. A drainage fault judgment method is applied to an air conditioner and is characterized in that a first electrode group (11) is arranged at a first preset height in a water pan (10) of the air conditioner, and the first electrode group (11) can be conducted when the water level of the water pan (10) reaches the first preset height, and the method comprises the following steps:

starting timing when the first electrode group (11) is conducted;

if the first electrode group (11) is continuously conducted within a first preset time, judging that the water receiving tray (10) has a drainage fault;

if the first electrode group (11) is conducted repeatedly for a first preset number of times within a second preset duration, the water receiving tray (10) is judged to have a drainage fault.

2. The drain fault determination method according to claim 1, wherein the step of starting timing when the first electrode group (11) is conducted by the condensed water in the water collector (10) further comprises:

when the first electrode group (11) is conducted by the condensed water in the water pan (10), the compressor is controlled to run at the minimum allowable frequency, and the internal expansion valve and the external expansion valve are controlled to be respectively adjusted to the maximum opening degree.

3. The method for determining a drainage fault according to claim 1, wherein a second electrode set (12) is disposed at a second preset height in a water receiving tray (10) of the air conditioner, the second preset height is higher than the first preset height, the second electrode set (12) is capable of conducting when a water level of the water receiving tray (10) reaches the second preset height, and after the step of starting timing when the first electrode set (11) is conducted by condensed water in the water receiving tray (10), the method further comprises:

when the second electrode group (12) is conducted, additionally starting timing;

if the second electrode group (12) is continuously conducted within a third preset time, judging that the water receiving tray (10) has a drainage fault;

and if the second electrode group (12) is repeatedly conducted for a second preset number of times within a fourth preset time, judging that the water receiving tray (10) has a drainage fault.

4. The drain fault determination method according to claim 3, further comprising, after the step of additionally starting timing when the second electrode group (12) is turned on:

and when the second electrode group (12) is conducted, controlling the compressor to stop, and controlling the internal expansion valve and the external expansion valve to keep the maximum opening degree.

5. The method for determining a drainage fault according to claim 1, wherein a third electrode group (13) is disposed at a third preset height in a water receiving tray (10) of the air conditioner, the third preset height is lower than the first preset height, the third electrode group (13) can be conducted when a water level of the water receiving tray (10) reaches the third preset height, and before the step of starting timing when the first electrode group (11) is conducted by condensed water in the water receiving tray (10), the method further comprises:

and when the third electrode group (13) is conducted for the first time, controlling the compressor to reduce the running frequency by a preset value, controlling the expansion valve of the inner machine to increase by a first preset step number, and controlling the expansion valve of the outer machine to increase by a second preset step number.

6. The method for determining a drainage fault according to claim 5, wherein after the steps of controlling the compressor to decrease the operation frequency by a preset value, controlling the internal expansion valve to increase by a first preset number of steps, and controlling the external expansion valve to increase by a second preset number of steps when the third electrode group (13) is first turned on, the method further comprises:

except for the first time, when the third electrode group (13) is conducted, judging the conducting condition of the first electrode group (11) during the period from the previous conducting of the third electrode group (13) to the current conducting of the third electrode group;

if the first electrode group (11) is conducted during the period, controlling the compressor to recover the initial frequency, and controlling the internal expansion valve and the external expansion valve to recover the initial opening degrees respectively;

and if the first electrode group (11) is not conducted in the period, controlling the compressor to reduce the running frequency by the preset value, controlling the internal expansion valve to increase the first preset step number, and controlling the external expansion valve to increase the second preset step number.

7. The utility model provides a drainage fault judgement device, is applied to the air conditioner, its characterized in that, the first preset height department in the water collector (10) of air conditioner is provided with first electrode group (11), first electrode group (11) can be in the water level of water collector (10) reach when first preset height switches on, the device includes:

the first timing module is used for starting timing when the first electrode group (11) is conducted;

the water receiving tray (10) drainage fault judging module is used for judging drainage fault of the water receiving tray (10) under the condition that the first electrode group (11) is continuously conducted within a first preset time length, and the water receiving tray (10) drainage fault judging module is further used for judging drainage fault of the water receiving tray (10) under the condition that the first electrode group (11) is repeatedly conducted within a second preset time length for a first preset number of times.

8. The apparatus according to claim 7, wherein a second electrode set (12) is disposed at a second predetermined height within a drain pan (10) of the air conditioner, the second predetermined height being higher than the first predetermined height, the second electrode set (12) being capable of being turned on when a water level of the drain pan (10) reaches the second predetermined height, the apparatus further comprising:

the second timing module is used for starting timing when the second electrode group (12) is conducted;

the judging module is further used for judging the drainage fault of the water receiving tray (10) under the condition that the second electrode group (12) is continuously conducted within a third preset time, and the judging module is further used for judging the drainage fault of the water receiving tray (10) under the condition that the second electrode group (12) is repeatedly conducted within a fourth preset time for a second preset number of times.

9. The drain fault determining apparatus according to claim 7, wherein a third electrode group (13) is disposed at a third predetermined height within a water pan (10) of the air conditioner, the third predetermined height being lower than the first predetermined height, the third electrode group (13) being capable of being turned on when a water level of the water pan (10) reaches the third predetermined height, the drain fault determining apparatus further comprising:

and the control module is used for controlling the compressor to reduce the running frequency by a preset value when the third electrode group (13) is conducted for the first time, controlling the expansion valve of the inner machine to increase a first preset step number, and controlling the expansion valve of the outer machine to increase a second preset step number.

10. An air conditioner characterized by comprising a controller for executing the drain malfunction determination method according to any one of claims 1 to 6.

Background

When the air conditioner operates in a refrigeration mode or a dehumidification mode, the temperature of the indoor heat exchanger is lower than the dew point temperature, more condensate water can be generated, and a water receiving disc of the air conditioner plays a role in receiving the condensate water and is discharged to the outside through the water outlet hole and the water outlet pipe.

In practical application, the water receiving tray is often in a drainage fault due to dust accumulation in the water receiving tray or bending deformation of the water outlet pipe and other reasons. And because the water collector belongs to the inner structure of air conditioner, the outlet pipe is wrapped up again usually, and the user can't in time discern the water collector drainage trouble, leads to the water collector water to overflow over to indoor ground, seriously influences user experience.

Disclosure of Invention

The invention solves the problem that the prior art cannot identify the drainage fault of the water pan in time.

In order to solve the problems, the invention provides a drainage fault judgment method which can timely identify the drainage fault of a water receiving tray, prevent water from overflowing and improve user experience.

The embodiment of the invention provides a drainage fault judgment method which is applied to an air conditioner, wherein a first electrode group is arranged at a first preset height in a water pan of the air conditioner, and the first electrode group can be conducted when the water level of the water pan reaches the first preset height, and the method comprises the following steps:

starting timing when the first electrode group is conducted;

if the first electrode group is continuously conducted within a first preset time, judging that the water receiving tray has a drainage fault;

and if the first electrode group is conducted repeatedly for a first preset number of times within a second preset duration, judging that the water receiving tray has a drainage fault.

In an optional embodiment, after the step of starting timing when the first electrode group is conducted by the condensed water in the water collector, the method further includes:

and when the first electrode group is conducted by the condensed water in the water receiving tray, controlling the compressor to run at the minimum allowable frequency, and controlling the inner expansion valve and the outer expansion valve to be respectively adjusted to the maximum opening degree.

In an optional embodiment, a second electrode set is disposed at a second preset height in a water pan of the air conditioner, the second preset height is higher than the first preset height, the second electrode set can be conducted when a water level of the water pan reaches the second preset height, and after the step of starting timing when the first electrode set is conducted by condensed water in the water pan, the method further includes:

when the second electrode group is conducted, additionally starting timing;

if the second electrode group is continuously conducted within a third preset time, judging that the water receiving tray has a drainage fault;

and if the second electrode group is repeatedly conducted for a second preset number of times within a fourth preset time, judging that the water receiving tray has a drainage fault.

In an optional embodiment, after the step of additionally starting timing when the second electrode group is turned on, the method further includes:

and when the second electrode group is conducted, controlling the compressor to stop, and controlling the internal expansion valve and the external expansion valve to keep the maximum opening degree.

In an optional embodiment, a third electrode set is disposed at a third preset height in a water pan of the air conditioner, where the third preset height is lower than the first preset height, the third electrode set may be turned on when the water level of the water pan reaches the third preset height, and before the step of starting timing when the first electrode set is turned on by condensed water in the water pan, the method further includes:

and when the third electrode group is conducted for the first time, controlling the compressor to reduce the running frequency by a preset value, controlling the expansion valve of the inner machine to increase by a first preset step number, and controlling the expansion valve of the outer machine to increase by a second preset step number.

In an optional embodiment, after the step of controlling the compressor to decrease the operating frequency by a preset value, controlling the inner expansion valve to increase by a first preset step number, and controlling the outer expansion valve to increase by a second preset step number when the third electrode group is turned on for the first time, the method further includes:

except for the first time, when the third electrode group is conducted, judging the conducting condition of the first electrode group during the period from the previous conducting of the third electrode group to the current conducting of the third electrode group;

if the first electrode group is conducted during the period, controlling the compressor to recover the initial frequency, and controlling the inner expansion valve and the outer expansion valve to recover the initial opening degree respectively;

and if the first electrode group is not conducted in the period, controlling the compressor to reduce the running frequency by the preset value, controlling the inner machine expansion valve to increase the first preset step number, and controlling the outer machine expansion valve to increase the second preset step number.

An embodiment of the present invention further provides a drainage fault determination device, which is applied to an air conditioner, wherein a first electrode group is disposed at a first preset height in a water pan of the air conditioner, and the first electrode group can be conducted when a water level of the water pan reaches the first preset height, and the device includes:

the first timing module is used for starting timing when the first electrode group is conducted;

the judging module is used for judging the drainage fault of the water receiving tray under the condition that the first electrode group is continuously conducted within a first preset time length, and the judging module is further used for judging the drainage fault of the water receiving tray under the condition that the first electrode group is repeatedly conducted within a second preset time length for a first preset number of times.

In an optional implementation manner, a second electrode group is disposed at a second preset height in a water pan of the air conditioner, the second preset height is higher than the first preset height, the second electrode group can be turned on when the water level of the water pan reaches the second preset height, and the drainage fault determination device further includes:

the second timing module is used for starting timing when the second electrode group is conducted;

the determination module is further configured to determine that the drain fault of the water receiving tray occurs when the second electrode group is continuously conducted within a third preset time period, and the determination module is further configured to determine that the drain fault of the water receiving tray occurs when the second electrode group is repeatedly conducted within a fourth preset time period for a second preset number of times.

In an optional embodiment, a third electrode set is disposed at a third preset height in a water pan of the air conditioner, the third preset height is lower than the first preset height, the third electrode set can be turned on when the water level of the water pan reaches the third preset height, and the drainage fault determination device further includes:

and the control module is used for controlling the compressor to reduce the running frequency by a preset value when the third electrode group is conducted for the first time, controlling the expansion valve of the inner machine to increase a first preset step number, and controlling the expansion valve of the outer machine to increase a second preset step number.

An embodiment of the present invention further provides an air conditioner, including a controller, where the controller is configured to execute the drainage fault determination method, a first electrode group is disposed at a first preset height in a water pan of the air conditioner, and the first electrode group can be turned on when a water level of the water pan reaches the first preset height, and the method includes: starting timing when the first electrode group is conducted; if the first electrode group is continuously conducted within a first preset time, judging that the water receiving tray has a drainage fault; and if the first electrode group is conducted repeatedly for a first preset number of times within a second preset duration, judging that the water receiving tray has a drainage fault.

Drawings

Fig. 1 is a schematic structural view of a water pan applied to an air conditioner according to an embodiment of the present invention;

FIG. 2 is a block diagram of a flow chart of a method for determining a drainage fault according to an embodiment of the present invention;

fig. 3 is a block diagram of a drain fault determination device according to an embodiment of the present invention.

Description of reference numerals:

10-a water pan; 11-a first set of electrodes; 12-a second electrode set; 13-a third electrode set; 100-a drainage fault judgment device; 110-a first timing module; 120-a judgment module; 130-a second timing module; 140-control module.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Referring to fig. 1, fig. 1 is a schematic structural view of a water pan 10 applied to an air conditioner according to the present embodiment. The water pan 10 is provided with a first electrode group 11 at a first preset height, a second electrode group 12 at a second preset height, a third electrode group 13 at a third preset height, the first preset height and the second preset height are sequentially increased in height in the vertical direction, and the first electrode group 11, the second electrode group 12 and the third electrode group 13 can be respectively conducted when condensed water in the water pan 10 reaches corresponding heights.

Referring to fig. 2, fig. 2 is a block diagram illustrating a flow chart of a method for determining a drainage fault according to the present embodiment. The drainage fault judging method is applied to the air conditioner provided with the water receiving tray 10 shown in fig. 1, can timely identify the drainage fault of the water receiving tray 10, prevents water from overflowing, and improves user experience. The drainage fault judgment method comprises the following steps:

and step S101, when the third electrode group 13 is conducted for the first time, controlling the compressor to reduce the running frequency by a preset value, controlling the expansion valve of the inner machine to increase by a first preset step number, and controlling the expansion valve of the outer machine to increase by a second preset step number.

Under the operation of the air conditioner in a refrigeration mode or a dehumidification mode, condensed water appears on the outer surface of the indoor heat exchanger and falls into the water pan 10, under the normal condition, the condensed water in the water pan 10 is guided out by the water outlet pipe, and the accumulation speed of the condensed water in the water pan 10 is ensured to be less than or equal to the discharge speed through the preset size of the water outlet pipe. When the third motor set is turned on for the first time, the water level of the condensed water in the water receiving tray 10 is represented to reach a third preset height for the first time, and under the condition, the influence of the compressor, the inner expansion valve and the outer expansion valve on the accumulated amount of the condensed water in the water receiving tray 10 is eliminated by reducing the operation frequency of the compressor and improving the opening degrees of the inner expansion valve and the outer expansion valve, so that the accuracy of subsequent drainage fault judgment is ensured.

The preset value is between 3HZ and 10HZ, and an optimal value of 5HZ is selected in the embodiment; the first preset step number takes a value from 10 steps to 50 steps, and in the embodiment, an optimal value is taken for 20 steps; the second preset number of steps takes a value from 10 steps to 50 steps, and in this embodiment, an optimal value is taken for 20 steps.

In step S102, except for the first time, when the third electrode group 13 is turned on, it is determined that the first electrode group 11 is turned on during a period from the previous time when the third electrode group 13 is turned on to the current time.

For example, when the third electrode group 13 is turned on for the second time, it is determined whether the first electrode group 11 is turned on during a period from when the third electrode group 13 is turned on for the first time to when it is turned on for the second time.

In step S103, if the first electrode group 11 is turned on during this period, the compressor is controlled to return to the initial frequency, and the internal expansion valve and the external expansion valve are controlled to return to the initial opening degrees.

If the first electrode group 11 is conducted during the period from the first time the third electrode group 13 is conducted to the second time, it means that the water level is going to drop, in this case, the compressor is controlled to resume the frequency before the adjustment in step S101, and the internal expansion valve and the external expansion valve are controlled to resume the opening degrees before the adjustment in step S101, respectively.

Step S104, if the first electrode group 11 is not turned on during the period, the compressor is controlled to decrease the operation frequency by a preset value, the inner expansion valve is controlled to increase the first preset step number, and the outer expansion valve is controlled to increase the second preset step number.

If the first electrode set 11 is not conducted during the period from the first time when the third electrode set 13 is conducted to the second time, it indicates that the water level fluctuates at the third preset height, in this case, the frequency of the compressor and the opening degrees of the internal expansion valve and the external expansion valve need to be further adjusted, so as to effectively control the condensed water generation speed.

Therefore, the control of step S101 is repeated again, the compressor is controlled to decrease the operation frequency by the preset value, the inner expansion valve is controlled to increase the first preset number of steps, and the outer expansion valve is controlled to increase the second preset number of steps. Namely, the compressor is controlled to reduce the running frequency by 5HZ, the expansion valve of the inner machine is controlled to increase by 20 steps, and the expansion valve of the outer machine is controlled to increase by 20 steps.

In step S105, when the first electrode group 11 is turned on, a timer is started.

The first electrode set 11 is turned on, which indicates that the water level in the drip tray 10 rises to a first predetermined height.

And step S106, when the first electrode group 11 is conducted by the condensed water in the water receiving tray 10, controlling the compressor to run at the minimum allowable frequency, and controlling the internal expansion valve and the external expansion valve to be respectively adjusted to the maximum opening degrees.

In order to prevent the water pan 10 from overflowing due to the continuous rise of the subsequent water level, the frequency of the compressor and the opening degrees of the inner expansion valve and the outer expansion valve need to be controlled. In this embodiment, the compressor is controlled to operate at the minimum allowable frequency, and the internal expansion valve and the external expansion valve are controlled to be adjusted to the maximum opening degree respectively.

In step S107, if the first electrode group 11 is continuously conducted within the first preset time period, it is determined that the drain of the water collector 10 is failed.

If the first electrode group 11 is continuously and always in a conducted state within a first preset time, a drainage fault of the water receiving tray 10 is judged, and under the condition, a drainage fault signal is sent out to remind a user of maintenance and repair so as to remove the fault.

The first preset duration is set within 10min to 30min, and in this embodiment, the preferred value is set to 20 min.

In step S108, if the first electrode set 11 is repeatedly conducted for the first preset number of times within the second preset duration, it is determined that the drain of the water collector 10 is failed.

In order to improve the accuracy of the determination, the method for determining a drainage fault provided in this embodiment further provides a determination basis, and in a second preset duration, the first electrode group 11 is repeatedly conducted for a first preset number of times, and a drainage fault of the water receiving tray 10 is also determined, in this case, a drainage fault signal is sent out to remind a user to perform maintenance and repair, so as to remove the fault.

The second preset time is taken within 10min to 30min, and in the embodiment, the optimal value is taken for 20 min; the first preset number takes a value between 1 and 10, and in this embodiment, an optimal value of 6 is taken.

In step S109, when the second electrode group 12 is turned on, a timer is started.

In practical applications, after the first electrode set 11 is conducted, before the determination condition related to the first electrode set 11 is not met, the second electrode set 12 may be conducted, that is, the water level in the water tray 10 rapidly reaches the second preset height, and when the second electrode set 12 is conducted, timing is started additionally.

And step S110, when the second electrode group 12 is conducted, controlling the compressor to stop, and controlling both the internal expansion valve and the external expansion valve to maintain the maximum opening degree.

The second preset height is closest to the upper edge of the water pan 10, so that when the second electrode group 12 is conducted, the water level is close to overflow, in this case, the compressor is controlled to stop, the internal expansion valve and the external expansion valve are controlled to keep the maximum opening degree, the continuous generation of condensed water is avoided, and the overflow of water is avoided.

In step S111, if the second electrode group 12 is continuously conducted within the third preset time period, it is determined that the drain of the drain pan 10 is failed.

If the second electrode group 12 is always kept in a conducting state within a third preset time, a drainage fault of the water pan 10 is judged, and under the condition, a drainage fault signal is sent out to remind a user of maintenance and repair so as to remove the fault.

The third preset time is a value within 3min to 20min, and an optimal value is 5min in this embodiment.

In step S112, if the second electrode group 12 is repeatedly conducted for a second preset number of times within a fourth preset time period, it is determined that the drain of the water collector 10 is faulty.

Similarly, in order to improve the accuracy of the determination, the method for determining a drainage fault according to this embodiment further provides a determination basis, and in a fourth preset duration, the second electrode group 12 is repeatedly conducted for a second preset number of times, and a drainage fault of the water receiving tray 10 is also determined, in this case, a drainage fault signal is sent out to remind a user to perform maintenance and repair, so as to remove the fault.

Taking a value within 3min to 20min for the fourth preset time, wherein an optimal value is taken for 5min in the embodiment; the second preset number takes a value from 1 to 6, and in this embodiment, an optimal value of 3 is taken.

In summary, according to the drainage fault determination method provided in this embodiment, the drainage fault condition of the water tray 10 is automatically determined by conducting the first electrode group 11, the second electrode group 12, and the third electrode group 13, which are arranged at different heights in the water tray 10, so as to identify the drainage fault in time and remind a user of maintaining the drainage fault in time. And the frequency of the compressor and the opening degrees of the internal expansion valve and the external expansion valve are adjusted according to the respective conduction conditions of the first electrode group 11, the second electrode group 12 and the third electrode group 13, so that water is prevented from overflowing under the condition of water drainage failure of the water pan 10, and the user experience is improved.

In fact, with the drainage fault determination method provided in this embodiment, before starting execution, it is necessary to determine the fault condition of the first electrode group 11, the second electrode group 12, and the third electrode group 13. Before step S101 is started, the air conditioner is operated in a heating or ventilation mode, in this case, the indoor heat exchanger does not generate condensed water, and no condensed water is accumulated in the water pan 10, i.e., none of the first electrode group 11, the second electrode group 12, and the third electrode group 13 is conducted.

In this case, if any one of the first electrode group 11, the second electrode group 12 and the third electrode group 13 is turned on, it indicates that there is a detection fault, in which case the air conditioner issues an alarm signal and the aforementioned drainage fault determination method is not subsequently performed.

It can be understood that, in the process of normally executing the drainage fault determination method, if a fault is determined to be detected when the third electrode group 13 and the second electrode group 12 are conducted while the first electrode group 11 is not conducted, or when the third electrode group 13 is not conducted while the first electrode group 11 and the second electrode group 12 are conducted, the subsequent steps of the drainage fault determination method are stopped, and an alarm signal is sent, so as to avoid erroneous determination.

Referring to fig. 3, fig. 3 is a block diagram illustrating a drainage failure determination apparatus 100 according to the present embodiment, where the drainage failure determination apparatus 100 is applied to an air conditioner equipped with the water pan 10 shown in fig. 1, and the drainage failure determination apparatus 100 includes: a first timing module 110, a determining module 120, a second timing module 130 and a control module 140.

The first timing module 110 is configured to start timing when the first electrode group 11 is turned on. It can be seen that the first timing module 110 is configured to execute the step S105 of the drainage fault determination method.

And the control module 140 is configured to control the compressor to operate at a minimum allowable frequency and control the internal expansion valve and the external expansion valve to adjust to maximum opening degrees respectively when the first electrode group 11 is conducted by the condensed water in the water pan 10. As can be seen, the control module 140 is configured to execute step S106 of the aforementioned drainage failure determination method.

The judging module is used for judging the drainage fault of the water pan 10 under the condition that the first electrode group 11 is continuously conducted within a first preset time, and the judging module is also used for judging the drainage fault of the water pan 10 under the condition that the first electrode group 11 is repeatedly conducted for a first preset number of times within a second preset time. It can be seen that the determination module is used for executing step S107 and step S108 of the above-mentioned drainage failure determination method.

The second timing module 130 is configured to start timing when the second electrode group 12 is turned on. It can be seen that the timing module is configured to execute step S109 of the aforementioned drainage failure determination method.

The control module 140 is further configured to control the compressor to stop when the second electrode group 12 is turned on, and control both the internal expansion valve and the external expansion valve to maintain the maximum opening degree. It can be seen that the control module 140 is further configured to execute the step S110 of the drainage fault determination method.

The determination module is further configured to determine that the water receiving tray 10 has a drainage fault when the second electrode group 12 is continuously conducted within a third preset time period, and the determination module is further configured to determine that the water receiving tray 10 has a drainage fault when the second electrode group 12 is repeatedly conducted within a fourth preset time period for a second preset number of times. It can be seen that the determining module is further configured to execute step S111 and step S112 of the above-mentioned drainage failure determining method.

The control module 140 is further configured to control the compressor to decrease the operating frequency by a preset value when the third electrode group 13 is turned on, control the inner expansion valve to increase the first preset number of steps, and control the outer expansion valve to increase the second preset number of steps. It can be seen that the control module 140 is further configured to execute the step S101 of the drainage fault determination method.

The control module 140 is further configured to control the compressor to recover the initial frequency and control the internal expansion valve and the external expansion valve to recover the initial opening degrees respectively when the first electrode group 11 is conducted during a period from the first time when the third electrode group 13 is conducted to the second time. It can be seen that the control module 140 is further configured to execute the step S102 of the drainage fault determination method.

The control module 140 is further configured to control the compressor to decrease the operation frequency by a preset value, control the internal expansion valve to increase the first preset number of steps, and control the external expansion valve to increase the second preset number of steps when the first electrode group 11 is not turned on during a period from when the third electrode group 13 is turned on for the first time to when the third electrode group 13 is turned on for the second time. It can be seen that the control module 140 is further configured to execute step S103 of the aforementioned drainage fault determination method.

In summary, the drainage fault determination apparatus 100 provided in this embodiment automatically determines the drainage fault condition of the water tray 10 by the respective conduction conditions of the first electrode group 11, the second electrode group 12, and the third electrode group 13 disposed in the water tray 10 at different heights, so as to realize timely identification of the drainage fault and prompt the user to perform maintenance in time. And the frequency of the compressor and the opening degrees of the internal expansion valve and the external expansion valve are adjusted according to the respective conduction conditions of the first electrode group 11, the second electrode group 12 and the third electrode group 13, so that water is prevented from overflowing under the condition of water drainage failure of the water pan 10, and the user experience is improved.

The embodiment further provides an air conditioner, which includes a controller and the water pan 10 shown in fig. 1, wherein the controller is used in the drainage fault determination method.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.