Wolf FGB-35 - Fault Code Troubleshooting - Part 1

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3064458_201811
34. Troubleshooting
Fault
code
Fault Possible causes Remedy
01 HLSC excess temp. The high limit safety cut-out (thermostat)
has responded.
The temperature at the heat exchanger
cover has exceeded 110 °C.
Combustion chamber contaminated.
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.
02 TL excess temp. One of the temperature sensors in the
ow or return has exceeded the tem-
perature limiter limit (105 °C).
System pressure
Air in heating circuit
Temperature limiter
Pump
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.
03 dt ow-return drift Sensor test function failed, temperature
difference between ow and return sen-
sor > 5 °C.
Check sensors, replace if necessary
04 No ame formation When the burner starts, no ame forms
by the end of safety time.
Monitoring electrode faulty
Ignition electrode faulty, ignition trans-
former faulty.
Gas supply
Gas condensing boiler contaminated
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.
05 Flame failure Flame failure during ame stabilisation
after ame detection
Monitoring electrode faulty
Flue path blocked
Condensate drain blocked
Gas type setting
Gas pressure
Flue gas recirculation
(ue gas in the ventilation air)
Gas condensing boiler contaminated
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.