10.4.1 Replacing the ionisation/ignition electrode
The ionisation/ignition electrode must be replaced if:
The ionisation current is < 4 µA.
The electrode is damaged or worn.
The electrode is included in the service kit.
1. 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.
2. Unscrew the two screws on the electrode.
3. Remove the entire component.
4. Fit the new ionisation/ignition electrode.
5. Reassemble the unit in reverse order.
10.4.2 Checking the non-return valve
Check the condition of the non-return valve. Replace the non-return valve
if it is defective, there is one in the service kit, or if there are traces of
condensation on the inside of the fan. Do this as follows:
1. Undo the 3 bolts from the adapter on the non-return valve holder (15
Nm torque).
2. Undo the 3 nuts from the adapter on the heat exchanger (15 Nm
torque).
3. Carefully remove the adapter with burner from the heat exchanger.
4. Remove the 4 bolts from the fan and remove the non-return valve
holder (5.5 Nm torque).
5. Check whether traces of condensation are visible on the inside of the
fan. Replace the non-return valve if there are visible traces of
condensation.
6. Inspect the non-return valve and replace it in the event of a defect or
damage.
7. When replacing the non-return valve, loosen the fixing screw of the
non-return valve and remove it.
8. Reassemble in the reverse order.
Caution
Use the specified torques when fitting nuts and bolts.
Make sure the gaskets are in place when fitting nuts and bolts.
Fig.87
Replacing the ionisation/ignition
electrode
AD-0000131-02
1
2
3
4
Fig.88
Checking the non-return valve
AD-0000134-02
1
3
5
4
4
2
10 Maintenance
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