Grundig GHP-MM08, Service Manual

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Heat Pump Monobloc Inverter / User Manual
202202 Heat Pump Space Heater 58
4.4.16 E02 E03 E04 E05 E06 E07 E08 E09 diagnosis and analysis
4.4.16.1 Diagnosis
These codes indicate heat pump shut down because of the error of temperature sensors.
!
E02 indicates discharge temperature sensor TP appeared an error.
!
E03 indicates coil temperature sensor T3 appeared an error.
!
E04 indicates outdoor ambient temperature sensor T4 appeared an error.
!
E05 indicates liquid temperature sensor T5appeared an error.
!
E06 indicates suction temperature sensor TH appeared an error.
!
E07 indicates domestic water tank temperature sensor TW appeared an error.
!
E08 indicates inlet water temperature sensor TA appeared an error.
!
E09 indicates outlet water temperature sensor TB appeared an error.
4.4.16.2 Possible causes
!
Temperature sensors are not connected properly or have malfunctioned.
!
Refrigerant system PCB or hydraulic module PCB is damaged.
4.4.16.3 Analysis and action
Notes:
1. Refer to Part 3, 7 Figure 3-7.1 for the location of temperature sensors.
2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If
the resistance is not consistent with the sensor’s resistance characteristics table, the sensor has
failed. Refer to Part 4, 4-5.1 “Temperature Sensor Resistance Characteristics” for the resistance of
sensors.
Temperature sensor connection on hydronic
system PCB and refrigerant system PCB are
loose? 1
E02 E03 E04 E05 E06 E07 E08 E09
Yes
Ensure these sensors are
connected properly
NO
Temperature sensors have short-circuits or
have malfunctioned? 2
Yes
Replace the sensors
NO
Replace refrigerant system PCB for E02/E03/ E04/E05/E06;
Replace hydraulic module PCB for E07/E08 /E09