10.3.1 Opening boiler
Danger of electric shock
Ensure that the boiler is disconnected from the power supply.
1. Remove the screw at the bottom of the front casing.
2. Remove the front panel.
3. Press the clips on the sides of the instrument box inwards to unlock it,
then tilt the instrument box forwards.
10.3.2 Replacing the ionisation/ignition electrode
The ionisation and ignition electrode must be replaced if:
The ionisation current is < 3 µA.
The electrode is damaged or worn.
The electrode is included in the service kit.
1. Switch off the boiler's electrical connection.
2. Close the gas tap under the boiler.
3. Close the main gas tap.
4. Unscrew the two screws located under the front housing by a quarter
turn and remove the front housing.
5. Press the clips on the sides of the instrument box inwards to unlock it,
then tilt the instrument box forwards.
6. Remove the plug of the electrode from the ignition transformer.
Important
The ignition cable is fixed to the electrode and therefore may not
be removed.
7. Unscrew the 2 screws on the electrode and pull these forwards.
8. Remove the entire component.
9. Fit the new ionisation/ignition electrode and the accompanying gasket.
10. Reassemble the unit in reverse order.
10.3.3 Cleaning the plate heat exchanger
Depending on the quality of the cold water and the operating mode,
limescale deposits can form in the plate heat exchanger. As a general
rule, a periodic inspection, along with cleaning, if necessary, is sufficient.
The following factors may affect the periodicity:
Water hardness.
Composition of the limescale.
Fig.96 Opening boiler
Fig.97 Replacing the ionisation/ignition
electrode
10 Maintenance
104 AMC 7686707 - v.01 - 06092018
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