REMEHA Selecta - 11.2.4 Checking the ignition electrode, cable and gasket

Remeha Selecta
54
11.2.4 Checking the ignition electrode, cable and gasket
Fig. 25 Electrode checking
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- Isolate the electrical supply to the boiler.
- Remove the boiler front casing cover.
- Pull off the spark plug cap from the electrode.
- Remove the two screws which secure the electrode, examine the earth lead which
is held by one of the screws.
- Remove the electrode and examine the porcelain for cracks and clean the spark
gap area with fine emery cloth to remove any unwanted debris.
- Check and replace the electrode gasket if it was damaged during removal.
- Check and adjust the spark gap to maintain a 3 to 4 mm dimension.
- Re-fit the electrode assemble and plug cap.
- Check the ionisation current with a DC voltmeter between terminal 4 on the green
X4 plug and a suitable earth connection.
- The maximum ionisation current is 9µA and any reading lower than 4µA will indicate
that the electrode will require replacement.
- Re-fit front casing cover replacing the gasket if it was damaged during removal.
Note: It is advisable to replace the electrode at least every two years to ensure reliable
operation.