Glow-worm COMPACT 100p Instructions For Installation And Operation Manual page 28

Winter Mode Summer Mode
Continued. Continued.
Press button to change
to summer mode.
Does summer mode
LED illuminate?
YES
Turn hot water demand on.
Does fan goto fast speed?
YES
Does main burner light?
YES
Connect a manometer
to gas valve and check
burner pressure. Adjust
hot water burner pressure
potentiometer. Does burner
pressure adjust accordingly?
YES
Is there a decrease in
electrical resistance across
the hot water thermistor as
temperature rises?
YES
Turn off hot water demand.
Does main burner go out?
YES
Does central heating
pump start and run for
a short time?
YES
OK.
BOILER FAULT FINDING
221680G
13 Fault Finding
YES
NO
NO
NO
NO
NO
NO
NO
Change P.C.B.
Using spare flow sensor.
Connect to P.C.B.
Then blow down flow sensor.
Does the fan goto fast speed?
Does signal at
air pressure switch
change over?
YES
Is there 230v at
main valve?
YES
Is there a mV signal
at the modureg?
YES
Change gas valve.
Is there 230v
at main valve?
Is there 230v
at pump?
YES
Change pump.
28
Change flow
YES
sensor.
NO
NO Change air
pressure switch.
NO
Change P.C.B.
Change the gas valve.
NO
Change P.C.B.
Change thermistor.
NO
Change the valve.
YES
Change the P.C.B.
NO
Change
P.C.B.
Change
P.C.B.
Diagram 13.4