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Boiler faults list
ERROR
CODE
COLOUR
DISPLAYED
ERROR MESSAGE
DESCRIPTION OF
TYPE OF ALARM
E010
Yellow
fl ame lockout/ACF electronic fault
defi nitive
E011
Yellow
extraneous fl ame
transitional
E020
Red
limit thermostat
defi nitive
E030
Red
fan fault
defi nitive
E040
Yellow
water transducer – load system
defi nitive
E041
Yellow
water transducer - press OK to fi ll the system
transitional
E042
Yellow
water pressure transducer fault
defi nitive
E060
Yellow
Domestic hot water probe fault
transitional
E070
Red
fl ow sensor faulty
fl ow sensor overtemperature
fl ow/return sensor diff erential alarm
transitional
defi nitive
defi nitive
E077
Red
main zone water thermostat
transitional
E080
Yellow
return line probe fault
return line probe overtemperature
outlet/return line probe diff erential alarm
transitional
defi nitive
defi nitive
E090
Red
fl ue gas probe faulty
fl ue gas probe overtemperature
transitional
defi nitive
E091
Yellow
clean primary heat exchanger
transitional
--
Yellow
water pressure low press OK to charge
transitional
--
Red
water pressure high check system
transitional
--
Red
boiler board communication lost
transitional
--
Red
BUS 485 communication lost
transitional
List of combustion faults
ERROR
CODE
COLOUR
DISPLAYED
ERROR MESSAGE
DESCRIPTION OF TYPE OF ALARM
E021
Red
ion alarm
These are temporary alarms that if they occur 6 times in an hour they become defi nitive; the
alarm E097 is displayed and is followed by post-purging for 45 seconds at the fan's maximum
speed.
It is not possible to release the alarm before the end of the post-purging unless the boiler's
power supply is switched off .
E022
Red
ion alarm
E023
Red
ion alarm
E024
Red
ion alarm
E067
Red
ion alarm
E088
Red
ion alarm
E097
Red
ion alarm
E085
Red
incomplete combustion
These are temporary alarms that if they occur 3 times in an hour they become defi nitive; the last
error to occur is displayed and is followed by a post-purging of 5 minutes at the fan's maximum
speed.
It is not possible to release the alarm before the end of the post-purging unless the boiler's
power supply is switched off .
E094
Red
incomplete combustion
E095
Red
incomplete combustion
E058
Red
mains voltage fault
Si These are temporary faults that restrict the ignition cycle.
E065
Red
current modulation alarm
E086
Red
fl ue gases obstruction alarm
Temporary fault signalled during Pre-Purging. Post-Purging is maintained for 5 min at maximum
fan speed.
