3064816_201804
95
40. Troubleshooting
Fault
code
Fault
Possible causes
Remedy
90
BCU communication
Communication between control unit
PCB and burner control unit disrupted
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.
95
Program mode
Burner control unit is controlled by PC
(only for service)
No action
96
Reset
Reset button pressed too many times
Switch mains supply ON/OFF and
immediately acknowledge fault message.
If fault persists, call out a contractor.
98
Flame amplifier
Flame detection fault
Monitoring electrode short circuit or
contamination
Wiring error on HCM-2 (low voltage
side)
- 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
99
Burner control unit
system fault
Internal burner control unit fault
GBC-e PCB faulty
Unknown GBC-e PCB
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.
107
HC pressure
System pressure too low
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 but no function, replace the pressure
sensor.
Press reset button.
116
External fault at
programmable
input E1
External fault reported at programmable
input E1 (fault message contact at
E1 has opened)
Rectify external fault; check lead.
Acknowledge fault message.
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
GLV = Gas/air mixture
dT
= Temperature differential
