Wolf CGB-2 Series Installation Instructions For Contractors page 96

Fault Fault
code
78 Header sensor faulty
90 BCU communication
95 Program mode
96 Reset
98 Flame amplifier
99 Burner control unit
system fault
107 HC pressure
116 External fault at
programmable
Input E1
Key:
BCC = Boiler coding card
BCU = Burner control unit
GCV = Gas combination valve
TM = Temperature monitor
TL = Temperature limiter
HLSC = High limit safety cut-out
eHLSC = Electronic high limit safety cut-out
GAM = Gas/air mixture
dT = Temperature differential
96
41. Troubleshooting
Possible causes
Sammlerfühler oder Fühlerleitung hat
Kurzschluss oder Unterbruch
Communication between control unit
PCB and burner control unit disrupted
Burner control unit is controlled by PC
(only for service)
Reset button pressed too many times
Fault in flame amplifier circuit
Monitoring electrode short circuit or
contamination
Wiring error on HCM-2 (low voltage
side)
Loose contact PWM connector or fan
power connection
Internal burner control unit fault
GBC-e PCB faulty
Unknown GBC-e PCB
System pressure too low
Supply line pressure sensor faulty
Pressure sensor faulty
External fault reported at programmable
input E1 (fault message contact at
E1 has opened)
Remedy
Header sensor:
- Check leads and plug-in connections.
- If OK and no function, replace the sensor.
- Press reset button
Press reset button.
Connection between GBC-e and HCM-2:
- Check engagement of the two PCB enclo-
sures.
- If OK and fault persists.
Check PCB plug on HCM-2.
If fault persists, call out a contractor.
No action.
Switch power supply OFF/ON.
If fault persists, call out a contractor.
- Press reset button.
Ionisation electrode:
- Check electrical connections.
- Check the condition of the electrode; clean
or replace if necessary.
- Adjust gap and position or replace if neces-
sary.
Check the electrical connection of the HCM-2
low voltage side
Check plug/lead for PWM signal fan for any
loose contact.
Internal burner control unit fault:
- Reset only possible after power supply
OFF/ON.
GBC-e PCB:
- Check plug-in connection or power supply
of GBC.
- If OK, request a service
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.
Press reset button.
Rectify external fault; check lead
Acknowledge fault message
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