Wolf CGB-2 Series Installation Instructions For Contractors page 90

Fault Fault
code
01 HLSC excess temp.
02 TL excess temp.
03 dt flow drift
04 No flame established
90
41. Troubleshooting
Possible causes
High limit safety cut-out (thermostat) has
responded
Temperature at the heat exchanger
cover has exceeded 185 °C
Combustion chamber contaminated
One of the temperature sensors
eHLSC1 or eHLSC2 on the combustion
chamber has exceeded the high limit
safety cut-out limit (108 °C)
System pressure
Air in heating circuit
Pump
Temperature differential between
temperature sensors eHLSC1 and
eHLSC2 > 6 °C at the combustion
chamber
When the burner starts, no flame forms
by the end of safety time
Monitoring electrode faulty
Ignition electrode faulty, ignition
transformer faulty
Gas supply
HG44 curves offset
Gas valve
Gas valve has been replaced
Gas condensing boiler contaminated
Remedy
High limit safety cut-out:
- Check cables and plugs
- If electrical connection OK and no func-
tion: Replace HLSC
Combustion chamber:
- If combustion chamber is contaminated,
clean or replace combustion chamber
Check heating circuit pump
Vent the system
Press reset button
Check system pressure.
Vent heating circuit.
Temperature limiter (eHLSC):
- Check cables and plugs.
- If OK and no function, replace the eHLSC.
Pump:
- Check if pump is running.
- If not, check cables and plugs.
- If electrical connection OK and no func-
tion: Replace the pump.
Press reset button.
eHLSC:
- Faulty, replace eHLSC
Press reset button.
Gas supply:
- Check the gas train (gas valve open?).
Ionisation electrode:
- Check the position and condition of the
electrode, adjust or replace if necessary.
Ignition electrode:
- Check the position of the ignition elec-
trode and adjust if necessary. Check the
ignition transformer and wiring.
HG44 curves offset:
- Set HG44 to standard value
Gas valve:
- Check that the gas valve opens; if not,
check cables and plugs and repeat test.
- If faulty, replace the gas valve.
Press reset button.
- Set HG44 to standard value after replac-
ing the gas valve.
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