Wolf CGB-75 - Troubleshooting

58 3062555_201804
31.Troubleshooting
Any faults will be displayed as fault codes by Wolf controllers with eBUS capability. To these faults, cause and remedy may be
allocated using the following table. This table is designed to allow your local heating contractor to trace the fault more easily.
Fault
code
Fault Cause Remedy
1 TBV excess temperature
combustion chamber
cover STB
water pressure too low
Theowtemperaturehasexceededthelimitforthe
TBV shutdown temperature, or the heat exchanger is
extremely dirty, or the waterpressure switch switches off
atapressure<1.0bar
Check system pressure; check heating circuit
pump; vent the system; press reset; clean
the heat exchanger; check the TB combus-
tion chamber; increase system pressure;
checkdirtlter
4 Noame
established
Noamebuildsduringburnerstart. Check gas supply line, opening gas tap
if necessary; check ignition electrode and
ignition cable press reset button
5 Flame failure
during operation
Flamefailurewithin15sfollowingamedetection Check CO2 values, check ionisation elec-
trode and cable press reset button
6 DHWexcesstemperature Theow/returntemperaturehasexceededthelimitof
the TW shutdown temperature
Check system pressure. Vent the system.
Set the pump to stage 2 or 3.
7 TBA excess temperature
Excess pressure in
theuesystem
Theuegastemperaturehasexceededthelimitfor
theTBAshutdowntemperatureortheuesystemis
blocked, or the ventilation air is blocked.
Clean the heat exchanger
Checktheuesystem
Check the ventilation air
11 Flame pretence Aameisdetectedbeforetheburnerstarts Press reset button.
12 Faultyowsensor
gas pressure too low.
Thesensorfortheowtemperatureorthecableis
faulty,orthegaspressure<thantheselectedvalueat
the gas governor (only displayed after 15 min)
Check the cable
Checkowsensor
Check gas pressure
Check gas governor (accessory)
14 Cylinder sensor faulty DHWtemperaturesensororleadfaulty Check sensor and lead
15 Outside temperature
sensor faulty
The outside temperature sensor or cable is faulty Check cable
Check outside temperature sensor
16 Return sensor faulty The return temperature sensor or lead is faulty Check cable
Check return sensor
20 Fault, gas valve "1" Aameisrecognisedfor15secondsafterburner
operation, even though gas valve 1 has received a
shutdown command
Replace gas combination valve
21 Fault, gas valve "2" Aameisrecognisedfor15secondsafterburner
operation, even though gas valve 2 has received a
shutdown command
Replace gas combination valve
24 Gas fan fault The gas fan does not reach the required pre-purging
speed
Check the supply cable to the gas fan and
check the gas fan. Press reset button.
25 Gas fan fault The gas fan does not reach the ignition speed Check the supply cable to the gas fan and
check the gas fan. Press reset button.
26 Gas fan fault The gas fan does not stop. Check the supply cable to the gas fan and
check the gas fan. Press reset button.
30 CRC fault,
gas condensing boiler
The EEPROM record "Gas condensing boiler" is invalid Switch the power supply off and on. If unsuc-
cessful replace the controller PCB.
31 CRC error, burner The EEPROM record "Burner" is invalid. Switch the power supply off and on. If unsuc-
cessful replace the controller PCB.
32 Fault in 24 V AC
supply
24 V AC supply outside the permissible range
(e.g. short circuit)
Check the gas fan.
33 CRC error, default values The EEPROM record "Master reset" is invalid Replace control unit PCB
34 CRC fault, BCC Boiler coding card fault Replace boiler coding card
35 BCC missing Boiler coding card was removed Fit the correct boiler coding card
36 CRC fault, BCC Boiler coding card fault Replace boiler coding card
37 Incorrect BCC The boiler coding card is incompatible with the control
unit PCB
Fit the correct boiler coding card