1 Overheated CH Water temperature •Check no air is in heat exchanger/CH system
appliance greater than 105°C •Check plate heat exchanger for blockages Y
•Check CH thermistor
•Check system bypass is functional
4 No flame No flame signal on ignition •Check detection electrode/lead – electrode may require cleaning
•Check spark gap
•Check gas supply & pressure Y
•Check flue system is connected properly
•Check condensate trap not blocked
•Check gas valve and/or lead
5 Flame loss Loss of flame signal •Check detection electrode/lead Y
during operation •Check gas valve mains lead
6 Temporarily Water temperature •Check overheat thermostat
overheated appliance greater than 95°C •Check no air is in heat exchanger/CH system
•CH system and hot water plate heat exchanger blockage Auto Re-start after 1 minute
•Check CH thermistor
•Check system bypass is functional
7 Overheated appliance Flue over temperature •Check no air in heat exchanger
> 92°C •Check flue thermistor
•Check flue system Y
•Check pump
•Check PCB/X8 connector
11 Flame simulation Flame detected when •Check detection electrode/lead electrode may require cleaning Y
gas valve closed •Check gas valve operation.
12 No ignition CH Flow thermistor failure •Check CH flow thermistor – open circuit Auto Re-start when fixed
•Check PCB/X6 connector – open circuit
13 No flame Flue thermistor failure •Check PCB/X8 connector
•Check flue thermistor Auto Re-start when fixed
•Check thermal fuse – open circuit
16 No ignition CH Return thermistor failure •Check CH return thermistor – open circuit Auto Re-start when fixed
•Check PCB/X6 connector – open circuit
20 No flame Gas valve V1-V2 failure •Check/replace gas valve
•Check gas valve harness Y
•Check PCB/X2A
24 Faulty fan signal, Missing or defective •Check fan operation
no flame and fan signal from fan. •Check fan connection Y
runs continuously •Check PCB/X3 connector
•Check flue condition
32 No flame Power supply failure •Check mains supply voltage to boiler Auto Re-start when fixed
•Check all PCB connectors
34 CRC Error / No flame Incorrect BCC •Replace correct BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
35 BCC Error / No flame Incorrect/missing BCC •Reseat or replace BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
36 BCC Error / No flame Damaged BCC •Replace BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
37 BCC Error / No flame Different BCC •BCC and PCB software incompatible, replace BCC Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
38 BCC Error / No flame Different BCC •Reset the appliance in accordance with BCC fitting instructions Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
39 BCC Error / No flame BCC installation failed •Refit BCC in accordance with BCC fitting instructions Auto Re-start when fixed
(BCC’s only fitted to replacement PCB’s)
41 Water flow failure/ Low water pressure •Check CH flow circulation
Flame for a short Reversed sensors •Check water pressure(> 0.5 bar)
period only •Check pump/lead Y
•Check expansion vessel
•Check flow and return sensors connected correct way around
42 Water flow failure/ Low water pressure •Check no air in heat exchanger
Flame for a short No flow •Check CH flow circulation
period only Dry run protection •Check water pressure(> 0.5 bar) Y
•Check pump/lead
•Check expansion vessel
50 BCC Error / No flame BCC Activation •Press reset to activate BCC (BCC’s only fitted to replacement PCB’s) Y
No light DHW cold Defective DHW flow switch •Check DHW flow turbine & lead Auto Re-start
display when or defective •Check DHW/CH thermistor when fixed
tap on DHW/CH thermistor •Check PCB/X4 connector
(No display) No light indication Defective power supply •Check power supply
•Check PCB/X1B connector Auto Re-start when fixed
•Check PCB fuse
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