Control/Return Thermistor And Overheat Thermostat Replacement; Ignition Electrode Replacement; Flame Sensing Electrode Replacement - IDEAL istor HE260 Installation And Servicing

68 CONTROL THERMISTOR, RETURN THERMISTOR
AND OVERHEAT THERMOSTAT REPLACEMENT
1. Refer to Frame 53 & 54.
2. Unclip the thermistor / thermostat from the flow / return
pipe and withdraw it from the controls compartment.
3. Disconnect the electrical leads from the thermistor /
thermostat.
4. Re-connect the electrical leads and re-assemble in
reverse order ensuring that the spring clip is securely
on the pipe.
5. Check the operation of the boiler. Refer to Frame 49.
Note.
O/H thermostat on flow pipe - orange wires
Flow thermistor on flow pipe - red wires
Return thermistor on return pipe - pink wires

69 IGNITION ELECTRODE REPLACEMENT

1. Refer to Frame 53 & 54.
2. Remove the boiler sealing panel. Refer to Frame 56.
3. Unplug the spark electrode lead from the spark generator.
4. Undo the 2 retaining screws holding the spark electrode to
the combustion chamber.
5. Remove the earth lead from the ignition electrode.

70 FLAME SENSING ELECTRODE REPLACEMENT

1. Refer to Frame 53 & 54.
2. Remove the boiler sealing panel.
Refer to Frame 56.
3. Unplug the sensing electrode lead
from the control box.
4. Undo the 2 retaining screws
holding the sensing electrode
to the combustion chamber.
5. Unbolt the sensing electrode
earth lead from the earth point
beneath the boiler.
6. Remove the electrode,
complete with grommet.
7. Fit the new sensing electrode, using the
new gasket supplied, check dimensions
as shown.
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Installation and Servicing
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6. Remove the electrode, taking care not to dislodge the
grommet from the casing.
7. Fit the new ignition electrode, using the new gasket
supplied, check dimensions as shown.
8. Re-assemble in reverse order and check that no damage to
the combustion chamber insulation has occurred during
electrode replacement.
9. Check the operation of the boiler. Refer to Frame 49.
5
4
8. Re-assemble in reverse order and check that no
9. Check the operation of the boiler. Refer to Frame 49.
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damage to the combustion chamber insulation has
occurred during electrode replacement.
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