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6. Malfunction and Trouble Shooting
6.1 Error code display on LED wire controller
Malfunction
Inlet water temperature sensor
failure
Outlet water temperature sensor
failure
Heating piping sensor failure
Gas return sensor failure
Ambient temperature sensor failure
Exhaust piping sensor failure
Antifreeze protection in Winter
Low ambient temperature protection
Piping temperature too high
protection under cooling mode
T2 water temp. Too low protection
under cooling mode
High pressure failure
Low pressure failure
Water flow failure
Over heating protection for water
temperature (T2) in heating mode
T6 Exhaust too high protection
Controller failure
Error code
PP01
1. The sensor in open or short circuit
2. The wiring of sensor is loose
PP02
1. The sensor in open or short circuit
2. The wiring of sensor is loose
PP03
1. The sensor in open or short circuit
2. The wiring of sensor is loose
PP04
1. The sensor in open or short circuit
2. The wiring of sensor is loose
PP05
1. The sensor in open or short circuit
2. The wiring of sensor is loose
PP06
1. The sensor in open or short circuit
2. The wiring of sensor is loose
PP07
Ambient temperature or water inlet
temperature is too low
PP08
1.Beyond the scope of using
environment
2. Sensor abnormality
PP10
1. Ambient temperature is too high
or the water temperature is too high
in cooling mode
2. Refrigeration system is abnormal
1. Low water flow
PP11
2. T2 temperature sensor abnormal
EE01
1. Ambient temperature is too high
2. Water temperature is too high
3. Water flow is too low
Fan motor speed is abnormal or fan
motor has damaged
EE02
1. EEV has blocked or pipe system is
jammed
2. Motor speed is abnormal or
motor has damaged
3. Gas leakage
ON
1. Water flow switch is damaged
2. No/ Insufficient water flow.
EE04
1. Low water flow
2. Water flow switch is stuck and the
water supply is cut off
3. T2 sensor is abnormal
EE05
1.Lack of gas
2.Low water flow
3.Piping system has been blocked
4.Exhaust temp. Sensor failure
EE06
1. Wire connection is not good, or
damaged signal wire
Reason
65
Solution
1. Check or change the sensor
2.Re-fix the wiring of the sensors
1. Check or change the sensor
2.Re-fix the wiring of the sensors
1. Check or change the sensor
2.Re-fix the wiring of the sensors
1. Check or change the sensor
2.Re-fix the wiring of the sensors
1. Check or change the sensor
2.Re-fix the wiring of the sensors
1. Check or change the sensor
2.Re-fix the wiring of the sensors
Normal protection
1. Stop using, beyond the scope of
using
2.Change the sensor
1. Check the scope of using
2. Check refrigeration system
1. Check water pump and waterway
system
2. Change T2 temperature sensor
1. Check the water flow or water
pump
2. Check the fan motor
3. Check and repair the piping system
1. Check the EEV and piping system
Check the motor
2. Through the high pressure gauge
to check the pressure value
1. Change the water flow switch
2. Check the water pump or the
waterway system
1. Check the water way system
2. Check the water pump or water
flow switch
3. CheckT2 sensor or change another
one
1. Check the high pressure gauge, if
too low, fill with some gas
2. Check the waterway system and
water pump
3. Check the piping system if there
was any block
4. Change a new exhaust temp.
sensor
1. Check and re-connect the signal
wire
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