13
ROUTINE CLEANING AND INSPECTION
4.5. Flue system
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Check externally to make sure that flue is not blocked
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Inspect flue system to make sure that all fittings are secure.
4.6. Operation of fan
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Switch on electrical supply and turn on gas.
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Light burner by opening a hot water tap.
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Without upper cover in place, burner should be automatically prevented from lighting by air flow detection
system.
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Refit upper cover.
Check that fan operates when burner lights and stops when it goes out.
5.1. Before replacement of any part
Make sure that electric connection is disconnected and gas service cock is
closed.
For replacement of the following components it will be necessary
to remove boiler casing panels as described in ‘
Routine Cleaning
and Inspection’
.
WARNING:
Before commencing the replacement of any component,
isolate appliance from electrical supply and turn off gas at service cock.
To empty entire central heating system:
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Turn the red tap of central heating safety valve to the left when all
isolation valves are open.
To empty only heating system of boiler:
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Close all isolation valves and turn the red tap of central heating safety
valve to the left.
To empty domestic hot water system:
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Close all isolation valves except domestic hot water outlet. Open one
or more hot water tap.
5.2. To replace domestic hot water thermistor
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Locate domestic hot water thermistor on hot water flow pipe
on left hand side of boiler. (Diagram 22)
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Unclip thermostat from pipe, see diagram 23.
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Disconnect leads from thermistor.
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Fit replacement thermistor.
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Fit leads to replacement thermistor, the polarity is not important.
5.3. To replace central heating thermistor
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Locate central heating thermistor on heating pipe on left
hand side of boiler. (Diagram 25)
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Unclip thermostat from pipe.
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Disconnect leads from thermistor.
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Fit replacement thermistor.
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Fit leads to replacement thermistor, the polarity is not important.
5. REPLACEMENT OF PARTS
Diagram 25
Diagram 22
Diagram 23
Diagram 24
