22
Mynute
7.8
FAULT FINDING
Before attempting any fault-finding, the electrical
checks as detailed in 7.7 must be carried out.
Isolate the appliance from the electrical supply.
Disconnect any external controls from terminals 3
& 4 of the appliance terminal strip, and make safe.
Insert a solid link-wire between terminals 3 & 4.
Ensure jumper tags are fitted to the main PCB at:
●
JP5
●
JP7
●
JP8 (natural gas only).
●
M7
Restore the electrical supply to the boiler and
turn the selector switch to the on position. The
boiler should now function as described in section
7.2. Should the boiler fail to respond, the internal
fuses and connectors should be checked to
ensure integrity and continuity. If the boiler still
fails to respond, refer to the detailed fault-finding
flowcharts overleaf.
7.9
FAULT CODES
When the boiler displays a fault code, the
appropriate code is shown on the display,
accompanied by a flashing red LED. To reset the
boiler, slowly turn the mode selector switch to
the reset position then back to the on position.
If the boiler does not reset, refer to the following
section and the detailed fault-finding flowcharts
overleaf.
FAULT CODE 01
Fault code 01 appears when the burner has failed
to ignite, or the flame supervision system has
failed to detect a flame.
●
Check incoming gas supply.
●
Check spark electrode.
●
Check polarity.
●
Check integrity of flue system.
●
Check gas valve.
●
Check ignition control PCB.
FAULT CODE 02
Fault code 02 appears if the boiler has
overheated.
●
Check high limit thermostat.
●
Check thermistor.
●
Check pump.
●
Check gas pressures.
FAULT CODE 03
Fault code 03 appears if the boiler of flue system
has developed a fault.
●
Check operation of fan.
●
Check flue venturi.
●
Check air pressure switch.
●
Check flue system.
FAULT CODE 04
Fault code 04 appears if the pressure in the boiler
is low.
●
Check water pressure.
●
Check water pressure switch.
●
Check water pressure gauge.
FAULT CODE 05
PCB fault.
FAULT CODE 06
PCB fault (ensure JP5 is inserted)
FAULT CODE 07
Fault code 07 appears if the thermistor has
developed a fault.
●
Check thermistor.
●
Check wiring continuity.
FAULT CODE 08 (only for 35e)
Fault code 08 appears if the burner thermostat
has been activated.
●
Check gas pressures
●
Check burner thermostat
●
Check wiring continuity
FAULT CODE 09
PCB fault.