Wolf COB - Troubleshooting

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34. Troubleshooting
Any faults will be displayed as fault code by Wolf control accessories with eBUS capability. The cause and remedy for a fault can
be established 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 Excess temperature
(high limit safety
cut-out)
The ow temperature has exceeded 110 °C Test heating circuit pump, vent system,
press reset, clean heat exchanger
4 No ame
established
No ame at burner start
Inspection window for ame monitor/mixer head
contaminated
Faulty ame monitor
Air in oil line
Negative pressure at oil pump too high, max. 0.3 bar
Overpressure at oil pump too high, max. 0.5 bar
Boiler dirty
Check oil line, if necessary check fuel
level, check ignition electrode and
ignition transformer, press reset
Check inspection window for ame
monitor/mixer head
Check ame monitor and lead
Siphon backpressure
Check free condensate drainage
Maintenance necessary
5 Flame failure during
operation
Negative pressure at oil pump too high, max.
0.3 bar, ue gas recirculation (ue gas in the
ventilation air)
Boiler dirty
Check CO
2
values, check ame monitor
and lead, press reset, check ue system
for leaks
Maintenance necessary
6 TW excess temperature The ow has exceeded the limit of the
temperature limiter (100 °C)
Vent the system, check the heating
circuit pump
7 Flue gas sensor excess
temperature
The ue gas temperature has exceeded 120 °C Clean heat exchanger, check whether
all displacement devices are installed
Check the ow through the boiler
Check boiler ow / boiler return
press reset
8 Flue gas/ventilation air
damper does not move
Flue gas/ventilation air damper contact (E1)
fails to close or open when there is a demand
Check ue gas/ventilation air damper
and wiring
11 Flame pretence A ame is recognised before the burner starts Press the reset
Check solenoid valve for oil pump
12 Faulty boiler sensor Faulty boiler sensor or lead Check sensor and lead
14 Faulty cylinder sensor
SF
Faulty cylinder sensor or lead Check sensor and lead
15 Faulty outside
temperature sensor
Faulty outside temperature sensor or lead Check sensor and lead
25 Fan fault The fan does not reach the set speed
Boiler dirty
Check power cable to fan and check
fan;
Check that the condensate can drain off
freely from the balanced ue system
press reset
Maintenance necessary
26 Fan fault The fan does not stop Check power cable to fan and check
fan; press reset
27 Faulty stratication
sensor
Faulty stratication cylinder sensor or lead Check sensor and lead