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Code Description Solution
E02.47 Failed Connecting Function Groups Function group not found:
Carry out an auto-detect
Restart the boiler
Replace the CU-GH PCB
E04.00 Safety parameters Level 5 are not correct or missing Replace the CU-GH PCB.
E04.01 Flow temperature sensor is either shorted or
measuring a temperature above range
Flow temperature sensor short circuited:
Bad connection: check the wiring and connectors
Incorrectly fitted sensor: check that the sensor has
been correctly fitted
Faulty sensor: replace the sensor
E04.02 Flow temperature sensor is either removed or
measuring a temperature below range
Flow temperature sensor open:
Bad connection: check the wiring and connectors
Faulty sensor: replace the sensor
E04.03 Measured flow temperature above savety limit No flow or insufficient flow:
Check the circulation (direction, pump, valves)
Check the water pressure
Check the cleanliness of the heat exchanger
E04.04 Flue temperature sensor is either shorted or
measuring a temperature above range
Flue gas temperature sensor short-circuited:
Bad connection: check the wiring and connectors
Incorrectly fitted sensor: check that the sensor has
been correctly fitted
Faulty sensor: replace the sensor
E04.05 Flue temperature sensor is either removed or
measuring a temperature below range
Flue gas temperature sensor open:
Bad connection: check the wiring and connectors
Incorrectly fitted sensor: check that the sensor has
been correctly fitted
Faulty sensor: replace the sensor
E04.07 Deviation in flow sensor 1 and flow sensor 2
detected
Flow temperature sensor deviation:
Bad connection: check the connection
Faulty sensor: replace the sensor
E04.08 Safety input is open Air pressure differential switch activated:
Bad connection: check the wiring and connectors
Pressure in flue gas duct is or was too high:
Non-return valve does not open
Siphon blocked or empty
Check that the air supply inlet and flue gas outlet
are not blocked
Check the cleanliness of the heat exchanger
E04.09 Deviation in flue sensor 1 and flue sensor 2 detected Flue gas temperature sensor deviation:
Bad connection: check the connection
Faulty sensor: replace the sensor
11 Troubleshooting
7665063 - v.05 - 18102018 79
79


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