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Code Display text Description Solution
E.02.15 Ext CSU Timeout External CSU Timeout CSU time out:
Bad connection: check the wiring and connec
tors
Faulty CSU: Replace CSU
E.02.17 GVC CommTimeout Gas Valve Control unit communica
tion has exceeded feedback time
Communication error with the security kernel:
Restart the boiler
Replace the CU-GH
E.02.32 AF comm err Auto filling installation communica
tion has exceeded feedback time
Refilling the central heating system takes too
long:
Check the system for leaks.
Check the water pressure in the system.
Check that the inlet gas valve is fully open.
Check that the main water valve is fully open.
Check the operation of the pressure sensor.
Check the operation of the safety valve.
E.02.35 Safety device lost Safety critical device has been dis
connected
Communication fault
Carry out an auto-detect
E.02.39 AF low presure rise No sufficient rise of pressure after
autofilling
The water pressure in the system has not risen
sufficiently during the automatic filling procedure:
Check the system for leaks.
Check the water pressure in the system.
Check that the inlet gas valve is fully open.
Check that the main water valve is fully open.
Check the operation of the pressure sensor.
Check the operation of the safety valve.
E.02.47 Failed Conn Funct Gr Failed Connecting Function Groups Function group not found:
Carry out an auto-detect
Restart the boiler
Replace the CU-GH
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
10 Troubleshooting
62 7684359 - v.11 - 13122021
62


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