Glow-worm COMPACT 100p Instructions For Installation And Operation Manual page 27

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.
YES
Can pilot be lit?
YES
Switch on main supply.
Do mains and winter
mode LEDs illuminate?
YES
Does low water
pressure LED flash?
NO
Does fan run at
low speed?
YES
Winter Mode
Continued.
BOILER FAULT FINDING
13 Fault Finding
NO
Refer to pilot fault finding.
NO
YES
Is there enough
system pressure?
NO
Re-pressurise
system.
NO
Is there 112v at
fan terminals?
Change fan.
Summer Mode
Continued.
Change P.C.B.
YES
Is there continuity
between common
and N/O?
Change water
pressure switch.
NO
Is the 1kohm
resistor OK?
YES
Change fan
resistor.
27
YES
Change
P.C.B.
NO
YES
Change
P.C.B.
NO
Diagram 13.4
221680G