Wolf FGB-35 - Fault Code Troubleshooting - Part 3

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3064458_201811
34. Troubleshooting
Fault
code
Fault Possible causes Remedy
27 DHW outlet sensor faulty DHW outlet sensor faulty.
Stratication sensor faulty.
DHW outlet sensor:
- Check cables and plug-in connections.
- If OK and no function, replace the sensor.
30 CRC burner control unit Invalid EEPROM data. Switch power supply OFF/ON.
If the fault persists, replace the PCB.
32 AC supply AC supply outside permissible range
( < 170 VAC).
Check the power supply.
Switch power supply OFF/ON.
47 Flow / return sensor
check failed
Value of ow sensor / return sensor
does not change (2 minutes) after
burner start.
System pressure too low.
Air in heating circuit.
Pump faulty / low output.
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.
85 Valve feedback fault The valve feedback does not corre-
spond to the control unit commands.
96 Reset Reset button pressed too many times. Switch power supply OFF/ON
If the fault persists, call out a contractor.
99 System fault, burner
control unit
Internal burner control unit fault.
PCB faulty.
Internal burner control unit fault:
PCB
- Check plug-in connection or
power supply.
- If OK, replace PCB.
Press reset button
107 HC pressure System pressure too low / too high.
Supply line pressure sensor faulty.
Pressure sensor faulty.
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.
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