Wolf FGB-K Series Installation And Maintenance Instructions For Contractors page 96

Fault Fault
code
01 HLSC excess temp.
02 TL excess temp.
03 dt flow-return drift
04 No flame formation
05 Flame failure
96
34. Troubleshooting
Possible causes
The high limit safety cut-out (thermostat)
has responded.
The temperature at the heat exchanger
cover has exceeded 110 °C.
Combustion chamber contaminated.
One of the temperature sensors in the
flow or return has exceeded the tem-
perature limiter limit (105 °C).
System pressure
Air in heating circuit
Temperature limiter
Pump
Sensor test function failed, temperature
difference between flow and return sen-
sor > 5 °C.
When the burner starts, no flame forms
by the end of safety time.
Monitoring electrode faulty
Ignition electrode faulty, ignition trans-
former faulty.
Gas supply
Gas condensing boiler contaminated
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 the ventilation air)
Gas condensing boiler contaminated
Remedy
High limit safety cut-out:
- Check cables and plugs.
- If electrical connection OK and
no function: 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 (flow / return)
- Check cables and plugs.
- If OK and no function, replace flow tem-
perature sensor or return temperature
sensor.
Pump:
- Check if pump is running.
- If not, check cables and plugs.
- If electrical connection OK and
no function: Replace the pump.
Press reset button.
Check sensors, replace if necessary
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 electrode
and adjust if necessary. Check the ignition
transformer and wiring.
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.
Gas type setting:
- Check gas type setting on the gas valve
and in H12.
Gas pressure:
- Check the gas supply pressure (flow
pressure). Monitoring electrode:
- Check the condition of the electrode; clean
or replace if necessary.
- Adjust gap and position or replace if
necessary.
Flue gas recirculation:
- Check flue path inside and outside the
appliance (leaking, blocked).
Press reset.
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