TROUBLESHOOTING
62
Procedure
E3 E4 Ed H3 H5 HA H9
Ec E7
↓
Temperature sensor connection on main PCB is
loose (1)
YES →
Ensure the sensor is connected properly
NO
↓
Temperature sensor has short-circuited or failed (2)
YES
→
Replace the sensor
NO
↓
Replace the unit’s main PCB
1 End water outlet temperature sensor, water side exchanger refrigerant inlet (liquid pipe) temperature
sensor, water side exchanger refrigerant outlet (gas pipe) temperature sensor, water side exchanger water
inlet temperature sensor and water side exchanger water outlet temperature sensor connections are port
CN6 on the unit’s main PCB. Domestic hot water tank temperature sensor connection is port CN13 on the
unit’s main PCB. Circuit 2 water outlet temperature sensor connection is port CN15 on the unit’s main PCB.
Ambient temperature sensor connection is port CN11 on the unit’s main PCB. Solar panel temperature sensor
connection is port CN18 on the unit’s main PCB. Inertial tank temperature sensor connection is port CN24 on
the unit’s main PCB. DHW tank temperature sensor connection is port CN16 on the unit’s main PCB.
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 the “Temperature
sensor resistance characteristics” table.
To Next Page
Loading...
Need help?
General