the compressor will be locked in the shutdown protection state. At this time, only the shutdown and
restarting can unlock the compressor.
4.3 High exhaust temperature failure:
After the compressor starts running for 1 minute, when the exhaust gas temperature is detected to be
higher than or equal to the exhaust high temperature protection value by 110°C for 10 consecutive
seconds, an high exhaust temperature alarm occurs and the compressor stops. At this time, controller
shows high temperature fault alarm code "02E". When the exhaust temperature drops back to 90°C, the
alarm is released and the normal temperature control function is restored.
If high temperature fault protection appears 3 times within half an hour, the controller will lock the
protection. And the compressor will be locked in the shutdown protection state. At this time, only the
shutdown and restarting can unlock the compressor.
4.4 Water flow failure (water cycle model):
After the circulating water pump starts, it detects that the water flow switch is in the off state for 10
seconds, then heat pump stops. At this time, the controller displays the water flow switch fault alarm
code “01E”.Periodically (1 minute) restarts the water pump and 10 seconds later, the flow switch is
detected. If water flow switch is closed, heat pump will goes to normal running. If the fault occurs 3 times
within 1 hour, the fault is locked and heat pump will not starts.
4.5 Antifreeze protection (water cycle model):
When the controller is powered on, when the ambient temperature too low, it will enter the antifreeze
mode to prevent the circulation line or the water tank from freezing.
When the ambient temperature is ≤ 2°C, heat pump enters the first-class antifreeze. When the circulating
water pump continuously stops for more than 30 minutes, it starts for 60 seconds, then repeats the cycle.
When the ambient temperature is ≤ 2 °C, and the water tank temperature is ≤ 5°C, heat pump enters the
secondary anti-freeze protection, Heat pump automatically turned on for heating. When the ambient
temperature ≥ 4 °C or the tank temperature ≥ 15 °C ,heat pump stops heating and exits the secondary
frost protection
4.6 Low ambient temperature protection:
When the ambient temperature is ≤ -9 °C, the compressor is prohibited from running. When the ambient
temperature is ≥ -7 °C, normal operation is resumed, This protection has no fault display.
4.7 Water temperature too low protection at cooling mode(water cycle heat pump)
In the cooling mode with compressor running for 5 minutes, if detects that the outlet water temperature is
<5 °C for continuous 5 seconds, heat pump enters subcooling protection. The compressor and the fan
stop running, And the water pump operates normally. When the outlet water temperature is detected to be
≥7 °C, heat pump exits the subcooling protection and enters normal operation.
4.8 Water temperature too high protection at heating mode (water cycle heat pump)
In the heating mode, after compressor running for 5 minutes, if the water temperature is detected by
continuous 5S ≥65 °C, it is judged that the outlet water temperature is too high. It will shutdown heat
pump for protection and when the outlet water temperature is detected to be ≤60 °C, the protection is
withdrawn.
4.9, temperature sensor failure:
Heat pump will stop once the water tank temperature sensor or outlet water temperature sensor or
ambient temperature sensor is faulty.
When absorb or exhaust or evaporator coil or water return temperature sensor is faulty, electric heater is
allowed to operate.
When the return water temperature sensor fails, the return pump is allowed to run (do not judge the return
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