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VII. Maintenance
1.Maintenance protection
1.1 Using a stiff nylon brush to clean the evaporator wings. Before scrub, clean it with vacuum cleaner. If there
is compressed air, you can use high pressure air to clean the condenser or evaporator.
1.2 Periodic inspecting if the air inlet or outlet is stopped up.
1.3 Pay close attention to the outlet, inlet/ suction pressure of the system. If there is any abnormity, find out the
reason and clearing the fault... If you cannot determine the reason, get in touch with the technician.
1.4 Periodic inspecting the electrical connections and regularly monitored the operating voltage, operating
current and phase balance. Timely to check the reliability of the electrical components, replace the expired and
unreliable parts timely.
1.5 Air source heat pump water heater uses patent heat exchanger and the outlet water temperature is high.
After long time operation, the heat transfer surface of the water side heat exchanger will be deposited calcium
oxide or any other minerals. If these minerals fouling too much on the heat transfer surface, it will effect heat
transfer performance which could lead to power consumption increase, compressor outlet pressure too high or
inlet pressure too low. So regular contaminant separation is necessary (Please use formic acid, citric acid,
acetic acid and other organic acid to clean, any cleaning agents contains chloral acid or fluoride is strictly
forbidden).
1.6 Do routine maintenance work can make more efficient use of heat pump water heaters, while for failure
problems can find in time, to avoid unnecessary trouble.
2. Error code and solution
2.1 Description of the error code
No.
Code
Fault illustration
No.
Code
Fault illustration
1
A21
Heat exchanger water tank temp.
sense fault
11
A40
Communication malfunction between
wired controller and main control panel
2
A22
Evaporator coil temp. sensor fault
12
A41
Communication malfunction between
main control panel and driver board
3
A23
Exhaust gas sensor fault
13
A42
Wired controller EEPROM fault
4
A24
Outdoor ambient temp.sensor fault
14
A43
Main control panel EEPROM fault
5
A25
Reserved
15
A61
Inverter drive module fault
