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Code Display text Description Solution
E.04.00 Parameter error Safety parameters Level 5 are not
correct or missing
Replace the CU-GH.
E.04.01 TFlow Closed Flow temperature sensor is either
shorted or measuring a temperature
above range
Flow temperature sensor short circuited:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Faulty sensor: replace the sensor
E.04.02 TFlow Open Flow temperature sensor is either
removed or measuring a tempera
ture below range
Flow temperature sensor open:
Bad connection: check the wiring and connec
tors
Faulty sensor: replace the sensor
E.04.03 Max Flow temp 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
E.04.04 TFlue Closed Flue temperature sensor is either
shorted or measuring a temperature
above range
Flue gas temperature sensor short-circuited:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Faulty sensor: replace the sensor
E.04.05 TFlue Open Flue temperature sensor is either re
moved or measuring a temperature
below range
Flue gas temperature sensor open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Faulty sensor: replace the sensor
E.04.06 Max Flue temp Measured flue temperature above
limit
-
E.04.07 TFlow Sensor Deviation in flow sensor 1 and flow
sensor 2 detected
Flow temperature sensor deviation:
Bad connection: check the connection
Faulty sensor: replace the sensor
E.04.08 Safety input Safety input is open Air pressure differential switch activated:
Bad connection: check the wiring and connec
tors
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
E.04.09 TFlue Sensor 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
10 Troubleshooting
54 7701838 - v.09 - 10122021
54


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