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Check that gas,water and electricity are available at the boiler. There must be no external
voltage applied to the control board via the central heating controls to the P.C.B.
Before commencment of test, isolate the boiler electricity supply,
ensure that the remote controls are not calling for duty (no red link in terminal block)
Refer to functional flow diagrams in conjuction with the following fault finding.
START
Remove the outer case, lower the control housing and remove cable restraints.
Check all connections on the control board and the boiler components,
rectify or renew as necessary. Two spare fuses are provided.
Can pilot be lit?
Refer to pilot fault finding.
Switch on main supply.
Do mains and winter
mode LEDs illuminate?
Change P.C.B.
Does low water
pressure LED flash?
Is there enough
system pressure?
Is there continuity
between common
and N/O?
Change
P.C.B.
Re-pressurise
system.
Change water
pressure switch.
Does fan run at
low speed?
Is there 112v at
fan terminals?
Is the 1kohm
resistor OK?
Change
P.C.B.
Change fan.
Change fan
resistor.
Winter Mode
Continued.
Summer Mode
Continued.
YES
YES
YES
NO
NO
NO
YES
YES
NO
NO
NO
YES
YES
YES
NO
NO
YES
13 Fault Finding
Diagram 13.4
7491
BOILER FAULT FINDING