Glow-worm Economy Plus 60F - Page 28

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28
221504A
NO
YES
Replace printed circuit board.
YES
NO
Is there 240V~ between pilot gas
valve solenoid blue and brown
connections?
Isolate supply, test harness continuity.
If satisfactory replace printed circiut board.
Isolate electrical supply test fan harness
continuity.
If satisfactory replace printed circuit board.
NO
NO
NO
NO
YES
NO
Does fan run?
NO
Correct power supply problem
YES
NO
NO
Check overheat reset.
If satisfactory replace overheat device
Replace thermostat.
Check yellow cable between printed circuit
board and air pressure switch.
If satisfactory replace printed circuit board.
YES
Replace air pressure switch.
Is there 240V~ between 12 and
10 and between 11 and 10 ?
YES
YES
Is neon 1 lit?
NO
YES
Is neon 2 lit?
YES
NO
Is neon 3 lit?
YES
YES
Replace fan.
YES
NO
Is there 240V~ between yellow
connection on overheat device and 10 ?
Is there 240V~ between 6 on
thermostat and 10 ?
Before detailed checking of electrical components ensure that remote controls are calling for heat. Check the gas supply is free of
obstructions and purged of air.
Check the overheat cutoff has not operated. Isolate the electrical supply and physically check ALL cables, connections and the printed
circuit board fuse. Check the air tubes to the air pressure switch. Switch on the electrical supply and check for correct polarity.
Turn the control thermostat to its maximum setting. Also check fuses.
Is there 240V~ between motor connections
on fan ?
Inspect air tubes for leaks, kinks and
correct fitting. If satisfactory replace faulty
air pressure switch.
Does pilot light?
YES
Is there a spark at pilot burner?
Check lead continuity and inspect electrode
and lead for damage.
YES
YES
NO
With pilot lit does spark stop?
Inspect electrode lead /connection
for poor contact. Check electrical supply
polarity and correct if necessary.
If satisfactory replace printed circuit board.
NO
NO
NO
NO
YES
YES
System satisfactory
YES
Replace printed circuit board.
Check for pilot jet blockage, incorrect
electrode adjustment. If satisfactory
replace gas valve.
YES
Does discharge tube flash on
printed circuit board during ignition
attempt?
Diagram 13.3
Replace gas valve.
A I R P R E S S U R E S W I T C H
M A I N T E R M I N A L S T R I P
C O N T R O L T H E R M O S T A T
Isolate supply, test harness and replace as
required.
Does main burner
light?
Is there 240V~ between main gas
valve solenoid black and blue cables?
NO
NO
YES
Is Neon 4 lit?
Does fan Hunt?
Is there 240V~ between 1 on air
pressure switch and 10 ?
Is there 240V~ between 3 on air
pressure switch and 10 ?
Is there 240V~between 2 on air
pressure switch and 10 ?
13 Fault Finding