1. EEV has blocked or pipe system is
jammed
2. Fan motor speed is abnormal or fan
motor is damaged under heating mode
3. Gas leakage
4. Low pressure wire is loose or
damaged
1.Check the EEV and piping system
2. Check the fan motor under heating
mode, replace a new one if it is abnormal
3. Check refrigeration system or check the
pressure value through the high-pressure
gauge.
4. Reconnect the low pressure wire or
replace a new low pressure switch
1. The wiring of water flow switch is
loose or water flow switch damaged
2. No/Insufficient water flow.
1. Check the wiring of water flow switch or
change a new one.
2. Check the filtration pump or the
waterway system if there is air or jammed
inside
Over heating
protection for water
temperature (d2- TH5)
in heating mode
1. Low water flow
2. Water flow switch is stuck and the
water supply stops
3. d2- TH5 outlet water temperature
sensor is abnormal
4. The difference of outlet water
temperature and set temperature is
7
℃
or above in heating mode
1. Check the water flow switch if it works
well
2. Check the filtration pump or the
waterway system if there is air or jammed
inside
3. Check d2- TH5 outlet water
temperature sensor or replace a new one.
4. Change the set temperature.
d6-TH3 Exhaust too
high protection
1. Lack of gas
2. Low water flow
3. Piping system has been blocked
4. Exhaust temp. sensor failure d6-TH3
5. Ambient temperature is too high
1. Check the pressure gauge, and fill with
some gas if it is lack of gas
2. Check the filtration pump or the
waterway system if there is air or jammed
inside
3. Check the piping system if there was
any block
4. Change a new exhaust temp. sensor
d6-TH3
5. Check whether the current ambient
temp. and water temp. are beyond the
running temp. of the machine
1. Signal is not well connected or
damaged
2. Controller failure
1. Stop the power supply and restart.
2. Re-connect the signal wire or replace a
new one
3. Replace a new controller
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