Glow-worm COMPACT 100e Instructions For Use Installation And Servicing page 30

Check appliance installation and
that it is mechanically correct.
YES
Check filters are clean and allow
adequate water flow.
YES
Is mains L.E.D. illuminated.
YES
Open a tap to create demand.
YES
YES
A
Demand L.E.D. illuminated.
YES
B
NO
Pump starts.
YES
C
NO
Fan starts.
YES
D
NO
Start spark.
YES
E
Gas control valve opens at
ignition rate (5-6 mbar).
YES
F
Burner pressure increases
to full rate.
YES
G
Turn control thermostat or flow
rate down to induce modulation.
YES
Domestic hot water operates.
YES
Switch to central heating demand.
YES
Demand L.E.D. illuminates.
YES
Follow B-G.
YES
Correct operation.
221894A
13 Fault Finding
NO
Check fuses and power supply.
NO
If lockout L.E.D. is illuminated, press reset.
NO
Check flow switch operation.
Check 230V supply to pump.
Check air pressure
Check 230V
switch operation.
supply to fan.
Check spark electrodes
and cables.
NO
Check gas control
valve cables.
NO
Goes to lockout.
NO
Is heating circuit
getting hot.
Manually push brass splindle in diverter
valve. Does domestic hot water get hot
when pushed in and central heating
water get hot when released.
NO
If domestic hot water demand is still illuminated.
Faulty domestic hot water switch.
Check the pump is not mechanically stuck.
Check thermistor.
Check primary circuit
overheat continuity.
Check gas control
valve voltage.
Check sensing electrode
and cables.
Check 3 way
valve operation.
30
Unplug fan and check
coil resistance.
Check air pressure switch status
and operation.
Check venturi and
connecting tubes.
Check burner for
cross lighting.
Unclip motor. Turn domestic hot water
Off and On. Does pin move in and out.
Replace motor.
Diagram 13.3