Supplied By www.heating spares.co Tel. 0161 620 6677
LED CODE
FAULT/EFFECT
REASON
ACTION
1 2 3 4
●
Check no air is in heat exchanger/CH system
●
Check pump operation
❍❍❍●
Overheated appliance
Water temperature greater than 105 °C
●
Check diverter valve operation
●
Check PCB/X1C connector
●
Check mains lead to pump
●
Check flow thermistor
●
Check gas supply
❍❍●❍
No gas/No flame
Low gas pressure
●
Check gas service cock
●
Check gas valve and lead
●
Check detection electrode/lead
❍❍●●
Lockout flame signal/
No flame signal on ignition, or loss
●
Check gas supply
Lockout after 5 ignition
of signal during operation
●
Check gas valve and lead
attempts
●
Check PCB/X2A & X2B connectors
●
Check spark generator/spark electrode
●
Check mains earth lead continuity
●
Check flue sensor
❍●❍❍
Flue gas sensor/
Flue gas temperature greater than 95 °C
●
Check flue system
No flame
●
Check no air is in heat exchanger/CH system
●
Check pump
●
Check PCB/PCB connectors
❍●❍●
Defective sensor/
Defective flow, return or flue sensor
●
Check flow, return and flue sensors
No flame
●
Check wiring to sensors
●
Check PCB/X6 & X8 connectors
❍●●❍
Defective gas valve/
5 sec flame signal after
●
Check gas valve and lead
Flame continues after
burner is switched off
●
Check PCB
demand ends
●
Check fan
●
Check mains fan lead & connector
❍●●●
Defective fan/No flame
Missing or Erroneous RPM signal
●
Check low voltage fan lead & connector
●
Check PCB/X3 connector
●
Check pump operation
●
Check diverter valve operation
●❍❍❍
CRC error/No flame
Internal Eprom data error
●
Check PCB
●❍❍●
Error in power supply/
Low mains voltage
●
Check mains voltage
No flame
●
Check PCB connectors
●
Check water pressure
●❍●❍
Water flow failure/
●
Check pump
Flame for a short
Sensor temperature differential incorrect
●
Check no air is in heat exchanger/CH system
period only
●
Check flow, and return sensors
●
Check wires to sensors not crossed
●❍●●
PCB error/No flame
Internal error
●
Check PCB
●●❍❍
BCC error/No flame
Incorrect /missing BCC
●
Reseat or replace BCC
●●❍●
Differential check faulty/
●
Check flow, and return sensors
Flame for 15 seconds
Zero check faulty DHW or CH
●
Check wires to sensors not crossed
●
Check PCB
●●●❍
Activate BCC/No flame
New BCC
●
Press reset to activate
●●●●
Safety system failure/
Failure of internal self checking system
●
Check PCB
No flame
●
Check DHW turbine & lead
❍❍❍❍
DHW cold
Defective DHW turbine or Diverter valve
●
Check Diverter valve & lead
●
Check PCB/X4 connector
●
Check filter in plate heat exchanger
●
Check power supply
❍❍❍❍
No light indication
Defective power supply
●
Check PCB/X1B connector
●
Check PCB fuse
❍❍❍❍
No flame
Faulty connector
●
Check PCB/X1A connector
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751030 MANUAL (NEW) 21/9/10 08:42 Page 31