3063772_201507
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35. Troubleshooting
Fault
code
Fault
Cause
Remedy
26
Fan speed >
The fan does not stop
Test the fan's PWM and power
cable, test fan, press reset, test flue
system for strong draught
30
CRC burner control unit
The EEPROM record is invalid
Switch the power supply OFF and
ON. If unsuccessful, replace the
burner control unit.
32
Fault in 23 V AC supply
23 V AC supply outside the permissible
range (e.g. short circuit)
Switch the power supply OFF and
ON. If unsuccessful, replace the
control PCB.
35
BBC missing
Boiler chip card has been removed or not
correctly inserted
Refit the correct boiler chip card
36
BCC faulty
Faulty boiler chip card
Replace boiler chip card
37
Incorrect BCC
The boiler chip card is incompatible with the
control PCB
Refit the correct boiler chip card
38
BCC update required
Boiler chip card fault, PCB requires a new
boiler chip card (replacement)
Reinsert boiler chip card, replace
boiler chip card
39
BCC system error
Faulty boiler chip card
Replace boiler chip card
41
Flow monitoring
Return temperature > flow temperature
Vent system, check heating circuit
pump, test flow and return pipe
connection
42
Condensate pump is not
pumping anything out
Faulty condensate pump, drain line blocked,
no power supply to pump
Check pump, check drain line,
check mains plug and fuse
44
Flue gas pressure switch
Flue system back pressure too high
Heat exchanger contaminated,
check flue system, test flue gas
damper, press reset
52
Max. cylinder heating time
Cylinder heating takes longer than permitted Test DHW sensor (cylinder sensor)
and sensor lead, press reset
53
IO control deviatn
Wind recognition, severe storm, insufficient
ionisation signal during operation, burner
contaminated
Test monitoring electrode, check
flue system, press reset, clean
burner
60
Siphon backpressure
Siphon or flue system is blocked
Clean siphon; test flue system,
ventilation air, gas supply pressure
(flow pressure) and monitoring
electrode
78
Header sensor fault
Faulty sensor or lead
Check sensor and lead; replace if
required
90
BCU comm error
Emergency stop via ChipCom, faulty
communication between control PCB and
burner control unit
Switch the power supply OFF
and ON. If unsuccessful, call in a
specialist contractor.
95
Prog. mode
Burner control unit is controlled by PC
No action
96
Reset
Reset button pressed too often
Switch the power supply OFF
and ON. If unsuccessful, call in a
specialist contractor
98
Flame amplifier
Internal burner control unit fault Monitoring
electrode short circuit
Press the reset button, and switch
the power supply OFF and ON. If
unsuccessful, call in a specialist
contractor, test monitoring electrode
99
Burner control unit
system fault
Internal burner control unit fault
Switch the power supply OFF
and ON. If unsuccessful, call in a
specialist contractor.
