12 Fault Finding
36
Fault Finding
If the Boiler Fails to Light
First follow the procedure below
Power Supply Check that fused spur for heating system and boiler is switched on.
Check that fuse has not blown.
Check that electricity supply has not failed: check circuit breaker in consumer unit.
Heating System Controls Check that timer or programmer is working and set to an ‘ON’ period.
Check that all thermostats are set to the required temperature and are ‘calling’ for heat.
Boiler Controls Check boiler ‘On/Off’ switch is set to ‘ON’.
Check that “POWER” indicator on the control panel is lit.
Check that “DEMAND” indicator is lit.
Burner Check if the burner ‘Lockout’ reset button (on front face of burner) is lit.
If YES: press in the reset button to start the burner.
If burner fails to light and goes to ‘Lockout’ again refer to section 12.4.
Heating System Check Heating System water pressure.
Check if “LOW PRESSURE” indicator is lit.
If YES: system water pressure has fallen to below 0.2 bar and the low pressure cut-out
has been activated.
Re-fill system to increase pressure to between 0.5 and 1.0 bar.
If Burner Still Fails to Light Follow the ‘BURNER NOT OPERATING’ procedure in Section 12.2(C).
For Hot Water – ALL the following indicator lights MUST be lit
POWER If NOT lit this indicates a problem with power supply to the boiler - switched off or
possibly a blown fuse.
DHW PUMP If FLASHING this indicates either a ‘Store’ thermistor or PCB fault.
Refer to ‘Is the “DHW PUMP” Indicator flashing’ procedure in Section 12.2 (B)
FLOW If not lit when a hot tap is opened this indicates either lack of water flow or possible
flow switch problem.
DEMAND If not lit this indicates either timer/programmer is not ‘calling’ for hot water or
‘Hot Water’ switch is not set to ‘CONSTANT’.
BURNER If flashing this indicates PCB fault.
Refer to ‘Is the “BURNER” indicator lit’ procedure in Section 12.2 (B)
NOTE:There may be a delay before the “BURNER” indicator is lit when the store is up to temperature
12.1 Initial Checklist - for Installer or Service Engineers
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