47
3062880_0910
Troubleshooting
Any faults will be displayed as fault codes by Wolf controllers with eBUS capability. Cause and remedy may be
allocated to these faults 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,
water pressure too low
The flow temperature has exceeded the limit
for the TBV shutdown temperature, or the
condensate lifting pump (accessory) has
developed a fault or the water pressure switch
switches off at a pressure < 1.0 bar
Check the system pressure. Check the heating
circuit pump. Vent the system. Press the reset
button
Check the condensate pump
Increase system pressure
4
No flame builds
No flame builds during burner start
Check the gas supply line and open the gas valve,
if necessary
Check the ignition electrode and ignition cable.
Press reset
5
Flame failure during
operation
Flame failure within 15 s after flame detection
Check CO
2
values. Check ionisation electrode and
cable. Press the reset button
6
TW excess
temperature
The flow/return temperature has exceeded the
limit for the TW shutdown temperature
Check the system pressure. Vent the system.
Set the pump to stage 2 or 3
7
TBA excess
temperature,
overpressure in the
flue gas system
The flue gas temperature has exceeded the
limit for the TBA shutdown temperature, flue gas
system is blocked, ventilation air is blocked
Clean the heat exchanger, check the flue gas
system
Check ventilation air system
11
Flame pretence
A flame is recognised before the burner starts
Press the reset button
12
Faulty flow sensor, gas
pressure too low
The flow temperature sensor or lead is faulty.
Gas pressure < than the value set at the gas
pressure switch (only displayed after 15 min)
Check lead
Check the flow sensor
Check gas pressure
Check the gas pressure switch settings
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 lead
Check the outside temperature sensor
16
Return sensor faulty
The return temperature sensor or lead is faulty
Check lead
Replace the return sensor
20
Fault, gas valve "1"
A flame is detected for 15 s after burner
operation, even though gas valve 1 has received
a shutdown command
Replace the gas combination valve
21
Fault, gas valve "2"
A flame is detected for 15 s after burner
operation, even though gas valve 2 has received
a shutdown command
Replace the gas combination valve
24
Gas fan fault
The gas fan does not reach the required pre-
purging speed
Check the gas fan supply cable and the gas fan;
press the reset button
25
Gas fan fault
The gas fan does not reach the ignition speed
Check the gas fan supply cable and the gas fan;
press the reset button
26
Gas fan fault
The gas fan does not stop
Check the gas fan supply cable and the gas fan;
press the reset button
30
CRC fault, gas
condensing boiler
The EEPROM record "Gas condensing boiler" is
invalid
Switch the power supply OFF and ON.
If unsuccessful, replace the control PCB
31
CRC fault burner
The EEPROM record "Burner" is invalid
Switch the power supply OFF and ON.
If unsuccessful, replace the control PCB
32
24 V AC supply faulty
24 V AC supply outside the permissible range
(e.g. short circuit)
Check the gas fan
33
CRC fault; default
values
The EEPROM record "Master reset" is invalid
Replace the control PCB
40
Flow monitoring
The flow limiter does not switch OFF or ON
Check flow switch
Check connection E1
41
Flow monitoring
Return temperature > Flow + 25 K
Vent the heating system, check the system
pressure. Check the heating circuit pump
60
Ionisation current
fluctuates
The siphon is blocked, or the flue gas system is
blocked, severe storm
Clean siphon, check flue gas system, check
ventilation air, check monitoring electrode
61
Ionisation current fails
Poor gas quality, monitoring electrode faulty,
severe storm
Check monitoring electrode and lead
LED constantly red
Ionisation cable shorted out or ionisation
electrode earthed (casing)
Check ionisation cable and position of electrode to
burner. Press the reset button
