Troubleshooting - Wolf CGB-75 Installation And Operating Instructions Manual

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 Fault
code
1 TBV excess temperature
combustion chamber
cover STB
water pressure too low
4 No flame
established
5 Flame failure
during operation
6 DHW excess temperature
7 TBA excess temperature
Excess pressure in
the flue system
11 Flame pretence
12 Faulty flow sensor
gas pressure too low.
14 Cylinder sensor faulty
15 Outside temperature
sensor faulty
16 Return sensor faulty
20 Fault, gas valve "1"
21 Fault, gas valve "2"
24 Gas fan fault
25 Gas fan fault
26 Gas fan fault
30 CRC fault,
gas condensing boiler
31 CRC error, burner
32 Fault in 24 V AC
supply
33 CRC error, default values
34 CRC fault, BCC
35 BCC missing
36 CRC fault, BCC
37 Incorrect BCC
58

31. Troubleshooting

Cause
The flow 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
No flame builds during burner start.
Flame failure within 15 s following flame detection
The flow/return temperature has exceeded the limit of
the TW shutdown temperature
The flue gas temperature has exceeded the limit for
the TBA shutdown temperature or the flue system is
blocked, or the ventilation air is blocked.
A flame is detected before the burner starts
The sensor for the flow temperature or the cable is
faulty, or the gas pressure < than the selected value at
the gas governor (only displayed after 15 min)
DHW temperature sensor or lead faulty
The outside temperature sensor or cable is faulty
The return temperature sensor or lead is faulty
A flame is recognised for 15 seconds after burner
operation, even though gas valve 1 has received a
shutdown command
A flame is recognised for 15 seconds after burner
operation, even though gas valve 2 has received a
shutdown command
The gas fan does not reach the required pre-purging
speed
The gas fan does not reach the ignition speed
The gas fan does not stop.
The EEPROM record "Gas condensing boiler" is invalid Switch the power supply off and on. If unsuc-
The EEPROM record "Burner" is invalid.
24 V AC supply outside the permissible range
(e.g. short circuit)
The EEPROM record "Master reset" is invalid
Boiler coding card fault
Boiler coding card was removed
Boiler coding card fault
The boiler coding card is incompatible with the control
unit PCB
Remedy
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 filter
Check gas supply line, opening gas tap
if necessary; check ignition electrode and
ignition cable press reset button
Check CO2 values, check ionisation elec-
trode and cable press reset button
Check system pressure. Vent the system.
Set the pump to stage 2 or 3.
Clean the heat exchanger
Check the flue system
Check the ventilation air
Press reset button.
Check the cable
Check flow sensor
Check gas pressure
Check gas governor (accessory)
Check sensor and lead
Check cable
Check outside temperature sensor
Check cable
Check return sensor
Replace gas combination valve
Replace gas combination valve
Check the supply cable to the gas fan and
check the gas fan. Press reset button.
Check the supply cable to the gas fan and
check the gas fan. Press reset button.
Check the supply cable to the gas fan and
check the gas fan. Press reset button.
cessful replace the controller PCB.
Switch the power supply off and on. If unsuc-
cessful replace the controller PCB.
Check the gas fan.
Replace control unit PCB
Replace boiler coding card
Fit the correct boiler coding card
Replace boiler coding card
Fit the correct boiler coding card
3062555_201804