Wolf COB-2 - Common Fault Diagnosis

Fault
66 | WOLF GmbH 3066501_201910
Fault
code
Message Cause Remedy
4 No ame – When the burner starts, no ame
forms by the end of safety time.
– Ignition electrodes contaminated.
– Air in the oil feed line.
– Heat generator contaminated.
► Check oil line, check oil level,
if necessary.
► Check ignition electrodes and
ignition transformer.
► Check solenoid valve for oil
pump.
► Check that the condensate
can drain off freely.
► Press reset button.
► Check CO
2
values.
► Service the equipment.
5 Flame failure – Flame failure during operation.
– Flue gas return system (ue gas
in the supply air).
– Air in the oil feed line.
– Heat generator contaminated.
► Check ue system for leaks.
► Check oil line, check oil level,
if necessary.
► Press reset button.
► Check CO
2
values.
► Service the equipment.
6 Temperature limiter,
excess temperature
– The ow has exceeded the limit of
the temperature limiter (95°C).
► Vent the system.
► Check the heating circuit
pump.
7 Flue gas sensor,
excess temperature
– The ue gas temperature has
exceeded 120°C.
► Clean the heating water heat
exchanger.
► Check that all displacement
devices are properly installed.
► Check the ow through the
heat generator.
► Check that the heating ow
and return are connected
correctly.
► Press reset button.
8 Flue gas/supply air
damper does not
respond
– Flue gas/supply air damper
contact (E1) fails to close or open
when there is a demand.
► Check wiring of ue gas/supply
air damper.
11 False ame – A ame is recognised before the
burner starts.
► Check solenoid valve for oil
pump.
► Check ignition electrodes and
ignition transformer.
► Press reset button.
12 Boiler sensor faulty – Faulty boiler sensor or lead. ► Check sensor.
► Check lead.
13 Flue gas sensor faulty – Faulty ue gas sensor or lead. ► Check sensor.
► Check lead.
14 Faulty cylinder sensor
CS
– Faulty cylinder sensor or lead. ► Check sensor.
► Check lead.
15 Outside temperature
sensor fault
– Faulty outside temperature sensor
or lead.
► Check sensor.
► Check lead.
22 Differential pressure
sensor not responding
– Supply air or ue gas path
blocked.
– Differential pressure too low in
pre-purge phase.
– Differential pressure sensor or
cable defective.
– Air ducts not connected or
incorrectly connected.
► Check supply air and ue gas
path.
► Check differential pressure
sensor.
► Check lead.
► Check air ducts.
23 Differential
pressure sensor not
deactivating
– Differential pressure sensor fails
to switch back.
– Inltrating air owing through the
heat generator.
► Check differential pressure
sensor.