1. Compressor stall: From the perspective of the anatomical phenomenon of most faulty compressors, there is no shortage of oil inside the compressor. Shaft stall is caused by instantaneous poor lubrication, and the main cause of poor lubrication is the oil quality. As a result, the oil is diluted or the oil level is raised by the refrigerant liquid.

2. There are two reasons for the compressor's pure motor burnout:

Motor temperature rise is too high; the inside of the refrigeration system is not clean. Motor temperature rise is too high: When the heat pump mechanism is hot in winter, the working conditions are harsh, especially when the ambient temperature is very low, the heat exchange capacity is small, the refrigerant circulation volume is also small, the return air pressure is low, plus the electric control up and down If the frost is not timely and thorough, it will cause insufficient cooling of the motor, heating of the coil, damage to the insulation, and short circuit of the motor.

The interior of the refrigeration system is not clean: In addition, the interior of the refrigeration system is not clean. It contains impurities, which corrode and wear motor coils, causing short-circuit burnout.

3. Analysis of communication failure reasons:

Check whether the four-core wires of the electrical control board and the panel are in good contact; check whether there is a 12V power output and whether the voltage is too high or too low; check whether the panel itself is faulty; check whether the panel matches the main board; avoid power interference.

4. Failure analysis of water temperature, environment, defrost, return water temperature sensors:

Check whether the temperature sensor line is disconnected or damaged; check whether the sensor resistance is normal; check whether the sensor resistance is broken.

5. Cause analysis of water flow failure:

Check whether the pump is turned on and whether there is air in the pump; check whether there is water in the water tank; check whether the water flow switch is damaged; check whether the two lines of the water flow switch are in good contact with the motherboard.

6. Cause analysis of high voltage protection: ·

Check whether the unit is under true high-pressure protection; check whether it is a high-pressure protection failure; check whether the pump has air and water pipe filters are blocked; check whether the unit system is blocked, mainly expansion valves, capillaries, filters; check high pressure Whether the switch is broken; check whether the two wires connected to the high-voltage switch on the electric control board are in good contact; check whether the high-voltage function of the electric control board has failed.

7. Cause analysis of low voltage protection:

Check whether the refrigerant is leaking; check whether the low pressure meter is really low pressure protection during operation; check whether the expansion valve, capillary tube and filter of the unit system are blocked; check whether the two wires connected to the low voltage switch on the electric control board are in good contact; Whether the function is invalid; check whether the system is leaking refrigerant.

8. Three-phase protection (phase sequence error, phase loss, excessive current) cause analysis:

Check whether the three phases of the unit's power supply are lacking; check whether the two wires on the phase sequence board are in good contact with the main board terminals; check whether the voltage is too low and the capacity of the power line is not sufficient, especially if the power line is very long

9. Reasons for power failure on the motherboard and panel after power on:

Check whether there is 220V power between the live and neutral wires on the power supply terminal of the motherboard; check whether the fuse on the motherboard is burned out; check the transformer and check whether the three terminals of the transformer are connected to the motherboard;

10. Power switch trip cause analysis:

If it trips as soon as the power is turned on, there will be leakage, short circuit, and grounding of the power cord. Check whether one of the water supply valve, water return valve, and water supply valve jumps as soon as it works.

11. Reasons for the water temperature not rising:

Check the unit for leakage of fluorine and observe the high and low pressure of the unit; check whether the amount of water exceeds the unit's water production; check whether the thermal insulation effect of the circulation pipeline, hot water pipeline and return pipeline of the unit is good; In particular, the temperature-controlled return water project consumes a large part of the heat to supply when the temperature is low in winter.

12. Cause analysis of defrosting problem:

Check whether the defrost probe is faulty; check whether the defrost probe is in good contact with the evaporator and the position is very correct; check whether the defrost probe has failed; check whether there are problems in the setting parameters

机组不运转 原因分析: 13. Analysis of reasons for non-operation of the unit :

Check for power failure, disconnect the power switch, check the power supply; check the unit's power wiring is loose, disconnect the power switch, check the power supply; check the unit control power fuse for blown, find out the cause and repair, replace the new fuse.

14. Reasons for the pump running but the water is not circulating or the pump is noisy:

Check the water supply system of the water shortage system and make up water to the system; check that there is air in the water system to remove the air from the water system; open all the valves of the water system and open the water system valve fully; check that the water filter is dirty , Clean the water filter.

15. Reasons for the low heating capacity of the unit:

Check whether the refrigerant is insufficient, check the system for leaks and charge the refrigerant; • Check whether the water system is poorly insulated and strengthen the water system; • Check whether the drying filter is blocked and replace the drying filter; , Clean the air heat exchanger; · Check whether the water flow is insufficient and clean the water filter.

16. Analysis of the reasons for the compressor not running:

Check whether the power supply is faulty, find out the reason to solve the power supply failure; check whether the wiring is loose, find out the loose point and repair; check whether the compressor is overheated and protect it, and then turn on the machine after removing the heat cause; check whether the water temperature is too high, and Set the outlet temperature; check whether the water flow is insufficient, and clean the water filter to remove air from the system.


Information source: heating information