Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
10 Troubleshooting
83311002 1/2018-03 La
97-132
The following faults must only be rectified by qualified personnel:
Fault codes
Cause
Rectification
F22
Flame failure during operation
(see also
W22
)
Check oil nozzle, if necessary replace
[ch. 9.10]
Check oil supply
Check oil pump, if necessary replace
[ch. 9.14]
Check flame sensor (USB-readout unit
KLC Com, Order No.: 90012181), if neces-
sary replace
Clean the light tube end piece, if necessary
check burner setting.
Check soundness of flue gas system [ch. 7.3].
Check the condensate drain
Check burner setting
Set nozzle distance [ch. 9.6]
Check mixing head [ch. 9.7]
F23
Flame simulation, e. g. reflection of ignition spark
through oil film in combustion chamber
Find and eliminate extraneous light source
Check flame sensor (USB-readout unit
KLC Com, Order No.: 90012181), if neces-
sary replace
Reset appliance, replace boiler
electronics WCM-OB-CPU if occurring re-
peatedly.
F30
Flow sensor defective
Check the sensor and cable and replace if ne-
cessary
F31
Flue gas sensor defective
Check the sensor and cable and replace if ne-
cessary
F36
System pressure < 0.5 bar
Check system pressure and top up
F37
Combustion air sensor defective
Check the sensor and cable and replace if ne-
cessary
F38
Buffer sensor (B10) defective
Check the sensor and cable and replace if ne-
cessary
F39
Buffer sensor/de-couple sensor (B11) defective
Check the sensor and cable and replace if ne-
cessary
F41
Flue gas damper is not operating
Check the flue das damper
F43
Specified fan speed is not achieved
Check the fan and cable and replace if
necessary [ch. 9.16]
Rectify electromagnetic disturbance source
(sensor cable)
F44
Fan standby defective
Check fan, if necessary replace [ch. 9.16]
Rectify electromagnetic disturbance source
F47
Ignition faulty
Check the ignition unit and replace if neces-
sary
F50
Electronic fault
Reset appliance, replace boiler
electronics WCM-OB-CPU if occurring re-
peatedly.
F51
Data record error condensing boiler
Reset the parameters that were previously
changed
Interrupt the voltage supply temporarily, reset
appliance if necessary
Reset appliance, replace boiler
electronics WCM-OB-CPU if occurring re-
peatedly.