Fault Finding
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C. Burner not Operating
First - Set either Hot Water or Heating to ON
Is the “BURNER” NO Refer to ‘Initial Checklist’ for guidance.
indicator lit?
NO Continue to next check.
Is the “BURNER” YES First – set boiler ‘On/Off’ switch to ‘OFF’.
indicator flashing? Fast or Slow flash. Wait 5 seconds.
Then set ‘On/Off’ switch back to ‘ON’.
If the “BURNER” Slow flash Replace PCB.
indicator continues (once every 2 seconds):
flashing. Indicates a possible fault
with the PCB (relay).
Is the “BURNER” YES Check all electrical connections to burner control Box.
indicator lit? PCB is supplying voltage to Check for 230V at L & N terminals in control box.
the Burner – but burner is Is Lockout button (on control box) lit?
not working. If YES: Press ‘Lockout’ button to reset burner.
If burner does not fire – refer to Section 12.4 Burner Fault Finding.
B. No Hot Water - but Central Heating OK continued
Is the “DHW PUMP” YES Check electrical connections at the pump.
indicator lit? PCB is supplying voltage to Check for 230V at the pump terminals.
the DHW pump – but pump Check if CH pump is stuck:
is not working. Remove pump vent screw and check for Rotation of shaft/impeller.
If stuck: Rotate shaft manually to restart.
If still not operating; Replace the DHW pump.
NOTE: A 6 metre pump must be used.
YES Check both pump valves are open.
DHW pump is working but Check Non-return valve on DHW pump is operational (not sticking).
no circulation. Check there are no air locks in the system. (If removal of air lock is
difficult – see additional check list).
Check the pump impeller is attached to the shaft.
YES Hot or warm water should be present at hot tap.
DHW pump is working If not refer to ‘Poor Hot Water’ Check List.
and water is circulating.
Is the “BURNER” YES Is burner firing?
indicator lit? If NO: Refer to ‘BURNER NOT OPERATING’ Procedure -
Section 12.2 (C).
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