Dehumidifier Troubleshooting

Dehumidifiers are becoming more and more accepted by people. Dehumidifiers can be seen in hotels, production workshops, storage warehouses and even daily life. For example, ATO's Commercial dehumidifiers and Industrial dehumidifiers have the characteristics of low noise, energy saving and high efficiency, which are very suitable for commercial or industrial environments. As an electrical appliance, it is inevitable that there will be malfunctions. The following is an analysis of the related failures of the dehumidifier.

No dehumidification

•  Ventilation system failure:

1. Air inlet grille and outlet grille: A. Man-made damage or aging and cracking; B. The wind in or out is severely blocked;
2. Air filter: blocked or damaged by dust;
3. Evaporator: A. Dust on the fins of the evaporator condenser; B. Ice on the surface of the evaporator;
4. Fan motor: A. The capacitor is damaged; B. Fan motor holding shaft; C. Rotor and shaft are loose; D. Bending of the shaft; E. Bearing damage; F. Burned windings;
5. Feng Ye: A. The fixing screws are loose; B. The fan blades are deformed or damaged; C. The dust on the wind blade is serious, which seriously affects the air output; D. The fan blades of small dehumidifiers still have the phenomenon that they are stuck due to serious dust accumulation.

•  Electrical system failure:

1. Neither the compressor nor the fan rotates: A. The power supply is cut off; B. The switch is not closed; C. The socket is disconnected; D.The voltage is too low; E. The circuit breaker is open; F. The fuse is blown.
2. The compressor does not turn, the fan turns: A. Starter failure; B. capacitor failure; C. Overload protection.
3. Compressor and fan are both running: the refrigeration system is faulty.

•  Refrigeration system failure:

1. All refrigerant leaks;
2. The refrigeration system is blocked: A. Dirty blockage; B. Oil blocking; C. Welding blockage;
3. Excess refrigerant;
4. The compressor has no displacement (fault).

• Compressor failure:

1. Poor compression, blow-by in the high and low pressure chambers;
2. The running parts are damaged and the compressor is holding the shaft.

The maintenance sequence of the dehumidifier noise increase failure:

1. The ground is uneven, and the dehumidifier is not stable;
2. Loose parts on the dehumidifier;
3. There are foreign objects in the dehumidifier;
4. Damaged or deformed fan blades cause the dynamic balance to be destroyed;
5. Starter failure;
6. There is a collision between the pipelines;
7. The fan is short of oil;
8. Fan bearing failure;
9. The compressor noise is too loud;
10. Too much refrigerant or lubricating oil is charged, causing liquid shock.

• Water to the ground

1. The commercial dehumidifier is placed unbalanced, and the sink is excessively inclined, causing water to overflow;
2. The drain hole or drain pipe of the sink is blocked;
3. The sink is damaged and leaks;
4. Water leakage at the outlet pipe connection or aging and cracking of the outlet pipe.

• Dehumidification becomes worse

1. The air filter has serious dust accumulation, and the airflow is blocked;
2. The air outlet sucks obstacles, and the airflow is blocked;
3. The fan speed slows down;
4. The room has poor airtightness, and a large amount of outdoor humid air infiltrates;
5. The room size is too large;
6. Excessive indoor moisture;
7. There is more dust on the evaporator fins, which reduces the effect of freezing and dehumidification;
8. Frost on the surface of the evaporator;
9. There is more oil in the evaporator, which reduces the effect of cooling and dehumidification;
10. Insufficient refrigerant charge;
11. Refrigerant leakage;
12. The capillary has the wrong specifications, the pipe diameter is large, and the throttling and pressure reduction is not enough;
13. Ice block in the refrigeration system;
14. Part of the refrigeration system is plugged;
15. There is air in the refrigeration system;
16. The compressor has poor compression and reduced displacement.

• The compressor does not start

1. The power supply is faulty and the voltage is too low;
2. The circuit fuse is blown or the switch is damaged;
3. The starting capacitor is damaged;
4. The overheat protection is not reset or malfunctions;
5. Various relays are not reset or malfunction;
6. The motor winding is open or burned.

• The key components
• The single-row heat exchanger dehumidifier is made of aluminum tubes. The aluminum tubes are exposed, and the water droplets cannot stay on the aluminum tubes and drip into the water tank quickly. Therefore, the dehumidifier will easily cause the illusion of "fast water flow and good dehumidification" when the dehumidifier is just turned on. But as soon as the machine stopped running, the dripping stopped quickly.
• The fin partial heat exchanger dehumidifier adopts aluminum sheet arrangement and copper pipe connection. The contact surface of the aluminum sheet is large. The water droplets will not start dripping until the aluminum sheet is covered. Therefore, it is easy to cause "slow water discharge. Poor dehumidification" when it is just turned on. "The illusion, but after the shutdown, the dripping will continue for a while.