Wolf FGB-K Series Installation And Maintenance Instructions For Contractors page 98

Fault Fault
code
27 DHW outlet sensor faulty
30 CRC burner control unit
32 AC supply
47 Flow / return sensor
check failed
85 Valve feedback fault
96 Reset
99 System fault, burner
control unit
107 HC pressure
Key:
BCU = Burner control unit
GCV = Gas combination valve
TM = Temperature monitor
TL = Temperature limiter
HLSC = High limit safety cut-out
GAM = Gas/air mixture
ΔT = Temperature differential
VAC = Mains voltage AC
98
34. Troubleshooting
Possible causes
DHW outlet sensor faulty.
Stratification sensor faulty.
Invalid EEPROM data.
AC supply outside permissible range
( < 170 VAC).
Value of flow sensor / return sensor
does not change (2 minutes) after
burner start.
System pressure too low.
Air in heating circuit.
Pump faulty / low output.
The valve feedback does not corre-
spond to the control unit commands.
Reset button pressed too many times.
Internal burner control unit fault.
PCB faulty.
System pressure too low / too high.
Supply line pressure sensor faulty.
Pressure sensor faulty.
Remedy
DHW outlet sensor:
- Check cables and plug-in connections.
- If OK and no function, replace the sensor.
Switch power supply OFF/ON.
If the fault persists, replace the PCB.
Check the power supply.
Switch power supply OFF/ON.
Check flow / return sensors.
Check system pressure.
Vent the system.
- Increase minimum pump speed.
Pump:
- Check if pump is running.
- If not, check cables and plugs.
- If electrical connection OK and no function:
Replace pump.
Switch power supply OFF/ON
If the fault persists, call out a contractor.
Internal burner control unit fault:
PCB
- Check plug-in connection or
power supply.
- If OK, replace PCB.
Press reset button
Check system pressure.
Check if supply line is faulty.
Pressure sensor:
- Check leads and plug-in connections.
- If OK and no function, replace the pressure
sensor.
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