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10.4
Specific maintenance operations
Fig.73
Remove detection/spark ignition
electrode
Fig.74
Remove flow and return sensors
Fig.77
Remove pressure sensor
66
600 System 2
10.4.1
Detection/ignition electrode replacement
Replace the detection//ignition electrode in the following cases:
1. Ionisation current <4 μA. To do this, activate the "chimney sweep
function" (chapter "Combustion settings") and set the boiler to the
minimum power. The ionisation value is visible with setting GM008
(chapter "Reading out measured values").
2. Electrode worn.
3. Distances out of range (chapter "Electrode distance").
To remove the electrode:
Disconnect the power supply to the boiler.
Cut off the gas supply to the boiler.
Remove the front panel on the boiler (case) and remove the electrode
pin and the earthing cable.
Unscrew the 2 screws on the ignition electrode and remove it.
Fit the new electrode with the gasket. To re-assemble, perform the
above actions in reverse order.
Flow and return sensors
10.4.2
There is one sensor on the flow (red wires) and one sensor on the return
(blue wires).
1. After noting the position of each sensor, prise the sensor clip off the
pipe and disconnect the plug.
2. Connect the plug to the new sensor and ease the clip onto the pipe
in its original position.
10.4.3
Pressure Sensor
1. Drain the primary circuit and undo the nut on the pressure gauge ca
pillary.
2. Ease the two retaining tabs holding the pressure gauge bracket
away and remove the bracket.
3. Remove the gauge assembly.
4. Examine the sealing washer on the pressure gauge capillary, re
place if necessary.
5. Reassemble in reverse order with the new pressure gauge.
10 Maintenance
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