10
CODE
FAULT
30
40
50
60
70
80
m m m m m l
Overheat sensor switch open.
m m m m l m
Overheating defect without lock out.
m m m m l
l
No flame detection.
m m m l m m
Ionisation printed circuit board faulty.
m m m l m l
Anti-frost mode on (pump in operation).
m m m l
l m
Anti-frost mode on (burner and pump in operation).
m m l m m l
Domestic hot water thermistor faulty (open circuit).
m m l m l m
Domestic hot water thermistor faulty (short circuit).
m m l m l
l
Central heating thermistor flow faulty (open circuit).
m m l
l m m
Central heating thermistor flow faulty (short circuit).
m l m m m l
Low water pressure in the Central Heating circuit.
m l m l m l
Fan on but does not activate air pressure switch.
m l m l
l m
Fan off but air pressure switch fails to return to off position.
Incorrects functions is signalled by leds (rep 22) display flashing correspond with chart below.
INCORRECT FUNCTION