43
SERVICING
Keston Combi - Installation and Servicing
49
RETURN THERMISTOR RENEWAL
1. Refer to Frame 44.
2. Unclip the return thermistor from the return pipe and withdraw it from the
boiler.
3. Disconnect the electrical lead from the thermistor.
4. Reconnect the electrical lead to the new thermistor and reassemble in
reverse order, ensuring that the thermistor is securely tted to the pipe on the
thermistor locator tabs as shown.
5. Check the operation of the boiler. Refer to Frames 29-35.
3
Thermistor Locator Tab
(with thermistor tted)
5
50
FLUE THERMOSTAT REPLACEMENT
1. Refer to Frame 45.
2. Undo the two screws and remove the
sump cover plate.
3. Disconnect the two ag terminals
from the ue thermostat.
4. Lift the manifold to clear the bottom
sealing gasket and remove manifold.
.
5. Unscrew the two M3.5 screws
that connect the thermostat to the
manifold.
6. Replace thermostat with new part
and then ret the two screws,
remembering to t rubber gasket and
sealing clamp.
Flue Thermostat
SERVICING
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