Troubleshooting - Wolf COB Technical Manual And Installation Instructions

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 Fault
code
1 HLSC excess temp.
4 None
flame established
5 Flame failure during
operation
6 Temperature limiter -
excess temperature
7 Flue gas sensor, excess
temperature
8 Flue gas/supply air
damper does not
respond
11 External light
recognition
12 Boiler sensor faulty
14 Faulty cylinder sensor
SF
15 Outside temperature
sensor faulty
25 Fan fault
26 Fan fault
27 Faulty stratification
sensor
68

39 Troubleshooting

Cause
The flow temperature has exceeded 110 °C
No flame at burner start
Inspection window for flame monitor/mixer head
contaminated
Faulty flame 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 contaminated
Negative pressure on the oil pump is too high,
max. 0.3 bar flue gas return system (flue gas in
the supply air)
Boiler contaminated
The flow has exceeded the limit of the
temperature limiter (100 °C)
The flue gas temperature
has exceeded 120 °C
Flue gas/ventilation air damper contact (E1)
fails to close or open when there is a demand
A flame is recognised before the burner starts
Faulty boiler sensor or lead
Faulty cylinder sensor or lead
Faulty outside temperature sensor or lead
The fan does not reach the set speed
Boiler contaminated
The fan does not stop
Faulty stratification cylinder sensor or lead
Remedy
Test heating circuit pump,
vent system press reset button,
clean heat exchanger
Check oil line,
if necessary check fuel level,
check ignition electrode and ignition
transformer,
press reset
Check inspection window for flame
monitor/mixer head
Check flame monitor and lead
Check that the condensate can drain
off freely
Service required
Check CO values,
2
check flame monitor and lead,
press reset, check flue system for
leaks, service required
Vent the system,
check the heating circuit pump
Clean the heat exchanger,
Check whether all displacement
devices are installed,
check the flow through the boiler
Check if flow and return are properly
connected
Press reset button.
Check flue gas/ventilation air damper
and wiring
Press reset
Check oil pump solenoid valve
Check sensor
and lead
Check sensor
and lead
Check sensor and lead
Check supply to the fan
Check fan
Check that the condensate can drain
off freely
Check balanced flue system press reset
Service required
Check power cable to fan
Check fan Press reset
Check sensor and lead
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