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UNIT HEATER
9.7 Simple Fault Finding - General
Some possible reasons for the heater not operating are:-
1. Gas supply not turned ON.
2. Electricity supply not turned ON.
3. The installed time and/or temperature controls are not “ON”.
4. One or both of the limit thermostats may have operated. This may be caused by
inadvertent removal of the electrical supply or failure of the distribution fan.
Limit thermostat 1 is on the combination thermostat. To reset, press in and release
the red reset button (see Figs in Section 1).
Limit thermostat 2 is under the screw on cover on the side or rear of the heater
(see Figs in Section 1).
To reset remove the screw on cover and press in the reset button. Replace the cover
after use.
If the Limit thermostats persistently operate then there is a fault which must be
investigated by a competent engineer.
Any other problem will require the assistance of a Service Engineer.
9.6.2 To Turn the Heater Off (Short Periods):
Operate the remote controls to the “OFF” position.
The burner will turn off immediately, but the distribution fan will continue to run for a few minutes to
cool the heat exchanger before turning off automatically.
The heater will then be at rest until the controls are turned on again.
9.6.3 To Turn the Heater Off (Long Periods):
Carry out the operations in 9.6.2 and allow the fan to stop automatically.
When the fan has stopped, turn off the gas and electricity supplies at the isolators.
To restart follow from 9.6.1
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