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35. Troubleshooting
Fault
code
Fault
Cause
Remedy
107
HC pressure
Water pressure too low, water pressure too
high
Test system pressure, test cable,
press reset, test water pressure
sensor
Button
Button
BCC
Boiler chip card
CRC
Cyclic redundancy check
EEPROM
Rewritable memory
BCU
Burner control unit
GCV
Gas combination valve
IO
Ionisation signal
HLSC
High limit safety cut-out
eHLSC
Electronic high limit safety cut-out
TL
Temperature limiter
TBA
Flue gas high limit safety cut-out
TW
Temperature limiter