Wolf CGB-2 Series Installation Instructions For Contractors page 91

Fault Fault
code
05 Flame failure
06 TL excess temp.
07 Flue gas TL, excess
temperature
08 Flue gas damper does
not switch
255 Fault code unknown
10 eHLSC sensor faulty
11 Flame pretence
3064810_201804
41. Troubleshooting
Possible causes
Flame failure during flame stabilisation
after flame detection
Monitoring electrode faulty
Flue path blocked
Condensate drain blocked
Gas type setting
Gas pressure
Flue gas recirculation
(flue gas in ventilation air)
Gas condensing boiler contaminated
One of the temperature sensors
eHLSC1 or eHLSC2 has exceeded the
limit of the temperature limiter (102 °C)
System pressure
Air in heating circuit
Temperature limiter in the flow
Pump
The flue gas temperature has exceeded
the flue gas temperature limiter's
shutdown temperature of 110 °C
Combustion chamber module
Combustion chamber
Flue gas temperature limiter
Flue gas damper contact (E1) closes or
does not open on demand; output A1
does not switch flue gas damper; flue
gas damper blocked
This fault is not known in this software
Temperature sensor eHLSC1, eHLSC2
on the combustion chamber or sensor
lead has short circuit or break
Flame signal is detected when burner
is off
Remedy
Gas type setting:
- Check gas type setting on the gas valve
and the AM/BM.
Gas pressure:
- Check the gas supply pressure (flow pres-
sure).
Ionisation electrode:
- Check the condition of the electrode,
clean or replace if necessary.
- Set gap and position or
replace if necessary.
Flue gas recirculation:
- Check the flue path inside and outside the
appliance (leaking, blocked).
Press reset button.
Check system pressure.
Vent heating circuit.
Temperature limiter in the flow:
- Check leads and plug-in connections.
- If electrical connection OK and no func-
tion, replace temperature limiter.
Pump:
- Check if pump is running.
- If not, check cables and plugs.
- If electrical connection OK and no func-
tion: Replace pump
Press reset button.
Combustion chamber module:
- Check installation position.
Combustion chamber:
- If the combustion chamber is heavily
contaminated, carry out maintenance or
replace.
Flue gas temperature limiter:
- Check leads and plug-in connections.
- If electrical connection OK and no func-
tion: Replace temperature limiter.
Flue gas damper:
- Check cables, plug-in connections and
power supply.
- Check the flue gas damper function.
- Check flue gas damper feedback.
- Check settings HG13 and HG14.
Press reset button.
Check software version of the PCBs.
Call a contractor
eHLSC on the combustion chamber:
- Check leads and plug-in connections.
- If electrical connection OK and no func-
tion, replace eHLSC.
Check monitoring electrode.
Press reset button.
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