MAITEC ARMATUREN 7008470M, User And Service Manual, Page: 61 / 89

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6. Troubleshooting
6.1 Error code display on LED wire controller
Malfunction Error code Reason Solution
Inlet water temperature sensor
failure
PP01 1. The sensor in open or short circuit
2. The wiring of sensor is loose
1. Check or change the sensor
2.Re-fix the wiring of the sensors
Outlet water temperature sensor
failure
PP02 1. The sensor in open or short circuit
2. The wiring of sensor is loose
1. Check or change the sensor
2.Re-fix the wiring of the sensors
Heating piping sensor failure PP03 1. The sensor in open or short circuit
2. The wiring of sensor is loose
1. Check or change the sensor
2.Re-fix the wiring of the sensors
Gas return sensor failure PP04 1. The sensor in open or short circuit
2. The wiring of sensor is loose
1. Check or change the sensor
2.Re-fix the wiring of the sensors
Ambient temperature sensor failure PP05 1. The sensor in open or short circuit
2. The wiring of sensor is loose
1. Check or change the sensor
2.Re-fix the wiring of the sensors
Exhaust piping sensor failure PP06 1. The sensor in open or short circuit
2. The wiring of sensor is loose
1. Check or change the sensor
2.Re-fix the wiring of the sensors
Antifreeze protection in Winter PP07 Ambient temperature or water inlet
temperature is too low
Normal protection
Low ambient temperature protection PP08 1.Beyond the scope of using
environment
2. Sensor abnormality
1. Stop using, beyond the scope of
using
2.Change the sensor
Piping temperature too high
protection under cooling mode
PP10 1. Ambient temperature is too high
or the water temperature is too high
in cooling mode
2. Refrigeration system is abnormal
1. Check the scope of using
2. Check refrigeration system
T2 water temp. Too low protection
under cooling mode
PP11
1. Low water flow
2. T2 temperature sensor abnormal
1. Check water pump and waterway
system
2. Change T2 temperature sensor
High pressure failure 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
1. Check the water flow or water
pump
2. Check the fan motor
3. Check and repair the piping system
Low pressure failure EE02 1. EEV has blocked or pipe system is
jammed
2. Motor speed is abnormal or motor
has damaged
3. Gas leakage
1. Check the EEV and piping system
Check the motor
2. Through the high pressure gauge
to check the pressure value
Water flow failure ON 1. Water flow switch is damaged
2. No/ Insufficient water flow.
1. Change the water flow switch
2. Check the water pump or the
waterway system
Over heating protection for water
temperature (T2) in heating mode
EE04 1. Low water flow
2. Water flow switch is stuck and the
water supply is cut off
1. Check the water way system
2. Check the water pump or water
flow switch