Supplied By www.heating spares.co Tel. 0161 620 6677
21
221481C
Isolate the supply. Gain access to the control
box, check all connections etc. Restore supply.
Using multimeter set at 240V.
Is there 240 V between L and N ?
Is there 240 V between 9 and N ?
With Red Link removed between 9 and SL
and Remote Controls Calling for Duty.
Is there 240V between SL and N ?
Is there 240 V between 9 and N ?
Is there 240 V between 8 and N ?
Is there 240 V between 3 and N ?
Turn ON thermostat. With appliance cold.
Is there 240V between 6 and N ?
Turn OFF thermostat.
Is there 240V between 6 and N ?
Isolate the supply. Remove gas valve cover.
Restore supply. Is there 240V between 'L'
and 'N' on gas valve ?
Faulty gas valve, renew.
Faulty gas valve harness, renew.
Turn ON thermostat. Does main burner light ?
Turn ON thermostat. With appliance cold.
Is there 240V between 7 and N ?
Turn ON thermostat.
Is there 240V between 7 and N ?
MAIN TERMINAL STRIP
THERMOSTAT TERMINALS
Faulty thermostat, renew.
Faulty cable (RED), from terminal block to
thermostat, repair or renew.
Faulty cable (RED), from terminal block to
thermostat, repair or renew.
Faulty cable (BROWN), from terminal block to
thermostat, repair or renew.
Faulty Remote Controls, inform customer.
Faulty Brown bridge wire between L and 9
Repair where required.
Check incoming supply and fuses.
Repair where required.
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
Continued
Continued
Continued
YES
YES
YES
NO
YES
YES
11 Fault Finding
Diagram 11.3
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