Nanjing Haizhizhou Heating and Cooling Equipment Co., Ltd. analyzes the common faults of air source heat pumps as follows:
1, phase sequence, phase loss, reverse phase protection
Fault analysis: Use a multimeter to check whether the three-phase power supply phase of the circuit board is 380V between the phase and the phase. If there is any fault, the fault may be reverse phase protection, and the two incoming lines adjacent to the power supply of the access unit are reversed. Yes, according to experience, most of the lines are reversed; otherwise, the fault may be phase loss protection, check whether the access power or access line is reliable.
2, water flow protection failure
Fault Analysis: Water flow protection faults are common in all engineering installations. Regardless of the installation problem, there are generally two possibilities for reporting water flow protection: the water system is not circulating and the water flow switch itself is damaged. Leading to water flow failures, often water problems.
Check and clean the pipeline filter. Check the pipeline valve and the circulation pump for damage or open. If it is normal, then the water flow switch itself is faulty. You can short-circuit it to see if it starts. If it can be started, it is water flow. Switch problem.
3, effluent overheat protection
Fault analysis: Whether the actual temperature of the water tank exceeds the set temperature; the tank sensor is not placed correctly or the tank sensor is not in close contact with the blind tube wall. The water tank temperature sensor is disconnected or the temperature sensor resistance drifts.
Check set temperature, a temperature probe. Check the water temperature value is consistent with the actual value, if the temperature is consistent, then the probe is broken replace the probe on the line. If these are not the problem, we need to look at the motherboard.
4, high-voltage protection
Fault analysis: Confirm that the high pressure of the system is too high through the pressure gauge, indicating that the waterway is faulty. There may be these problems: the actual flow of the circulating water pump is too small; the valve or filter in the waterway is blocked; the valve is not fully opened; the water temperature is set too high; Heater fouling is blocked; there is air in the water system; water is missing in the water system.
If the system high pressure does not reach the alarm pressure, check whether the pressure switch wiring is reliable, and re-plug the wiring plug. After the switch is turned off by the high-pressure detected by Wan table, if not the pressure switch may be turned General bad.
5, low voltage protection
Fault analysis: This fault is more common. The first consideration when encountering such a fault is the lack of fluorine and fluorine. In addition, it is necessary to check whether the unit is badly defrosted. If the fins of the unit are frosted seriously, it is necessary to check whether there is any problem with the fan. Fan failure will easily cause frost. Also, if the evaporator is not cleaned for a long time, it will be prone to low voltage failure.
It can be measured whether the low pressure is too low in the shutdown state, below 0.5MPa to find out whether the fluorine road has leakage points or blockage; above 0.5MPa, check the low pressure protection switch and expansion valve. After the shutdown, use the meter to check whether the low pressure switch is conducting. If it is not conducting, the pressure switch may be broken.
6, the exhaust temperature is too high protection
Fault analysis: When the unit is running, check whether the exhaust temperature value matches the actual temperature and check whether the exhaust temperature exceeds 120 °C. The exhaust temperature is not high, it may be that the exhaust temperature sensor is bad, the contact is bad, or the board is damaged.
Exhaust gas temperature is too high, the high and low pressure check is normal, the micro-expansion valve block, whether the lack of fluoride units, the four-way valve is blow-by gas, the gas compressor is the string, whether the coolant pipe clogging
7, water level switch failure
Fault analysis: Common causes are high and low water level reverse; low water level device wiring is poor; motherboard failure.
8, communication failure
Fault analysis: Check whether the shielded cable is disconnected in the middle, and the contact is poor when the two ends are plugged. If the disconnection is poor, the fault point can be judged by re-plugging, replacing the control panel, shielded wire, and circuit board. In addition, if the communication line is not a copper core wire, or the control board is wet, communication failure may occur.
9, temperature sensor failure
Fault analysis: First check whether the connector of the probe on the motherboard side is secure, and the motherboard has no problem. If there is no problem, it indicates that the corresponding temperature sensor is either short-circuited or disconnected. Check the corresponding sensor probe resistance. The normal resistance of the sensor is about 5kΩ at a temperature of 25°C (exhaust temperature sensor is 80°C, 50kΩ). If the resistance is normal and then re-plugged and confirmed, it will be judged as a board failure.
10. No display on the control panel display
Fault Analysis: Check that there is no power, check if the device fuse is blown properly. If these are normal, check the motherboard or monitor for any problems.
11, the water temperature is too low
Fault analysis: Check whether the outlet water temperature value matches the actual temperature. If it does not match, replace the outlet water temperature probe. If it matches the actual temperature, check whether the tank temperature value matches the actual value (if the tank temperature control machine works), check and clean the tube. Road filter, check whether the pipeline valve is damaged or not, check whether the circulation pump meets the unit flow requirements, and whether it is running normally.
12, the host does not work
Fault analysis: First of all, to ensure that the unit parameters are set correctly, and then check whether the power supply is faulty; check the compressor contactor for problems, and whether the wires are tight. In addition, if the compressor is operated at a high load for a long time, overheat protection will occur.
13, low heating capacity
Fault analysis: poor heat dissipation of air heat exchanger, cleaning air heat exchanger; insufficient water flow, cleaning filter; insufficient injection of refrigerant, leak detection and injection of quantitative working fluid; bad fan motor, serious frosting of evaporator; Not good, reheat the pipeline; the unit refrigerant system is clogged, detecting blocked parts; compressor problems, replacing the compressor.
14, the defrosting is not clean
Fault analysis: The coil probe is detached, check whether the temperature position of the coil probe is accurate and damaged; the defrosting parameter setting is not accurate, and the defrosting parameters are re-adjusted; the system lacks refrigerant.
15, the fan does not turn
Fault analysis: The fan motor is burnt, replaced or repaired; the contactor is broken, the contactor is replaced; the fan capacitor is broken, the capacitor is replaced; there is no start signal, and the main board fan has no start signal.
16, the pump does not start
Fault Analysis: Determine if the pump is stuck. It is very difficult to touch the water pump by hand or turn the fan blade with a screwdriver. It is very difficult to prove the pump shaft. The treatment method is to use a flat-blade screwdriver to turn the water pump fan. The pump card shaft needs to be replaced or repaired.
The main board water pump has no output signal. Use the multimeter's voltage file to directly measure the pump load port for output. No output proves that the motherboard has a problem. Just replace the main board.
The pump relay is burned out. The ohmic file of the multimeter is used to measure the normally open port of the water pump relay. When the measured resistance value is infinite, the relay is proved to be damaged. Of course, it is often visually judged whether it is burnt out. Only one relay needs to be replaced to make the pump run normally.
17, open trip
Fault analysis: empty open and close, replace one open and ensure that the line is not connected. If it is not possible, the compressor is grounded or there is a short circuit on the main board. After the judgment is accurate, the compressor or the main board needs to be replaced.
Occasionally tripping open, often caused by the empty connection of the open line, the key inspection line can be firmly connected. Of course, if the air is open, the humidity may cause the trip due to the humidity.
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