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Worcester-Bosch Greenstar HE Manual

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9
FAULT FINDER
Boiler does not fire and
burner lockout lamp is
not illuminated
Boiler does not fire and
burner lockout lamp is
illuminated
There is no demand for heat
from external control
equipment
There is no demand for heat
from the boiler temperature
control thermostat.
The automatic reset overheat
thermostat has operated.
Manual reset overheat
thermostat has operated.
There is no electricity supply to
the boiler.
The boiler has attempted to fire,
but has gone to lockout.
• Check the programmer is programmed for
hot water and/or central heating and re-
programme if necessary.
(See programmer operating instructions).
• If the boiler is programmed for central
heating, check the room thermostat is
turned on.
• Check any other control devices fitted.
• Turn the temperature control knob to
maximum.
• If the boiler is hot allow time to self reset.
• Press the reset button
(See section ‘High-limit thermostat).
• Check power supply is switched on.
• Check the external power supply fuse.
• Remove the appliance front cover and
depress the lockout reset button on the
burner. (See section ‘Lockout’).
• Check the level in your oil tank and
replenish if necessary.
If your boiler is not operating, it is suggested that you go
through the following simple checks before either calling your
installer or Worcester Heat Systems.
The flue gas thermostat has
operated.
• If the boiler is hot allow time to reset.
SYMPTOM POSSIBLE CAUSE CHECK/REMEDY
… 9 …


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