im 2520
Refer to Frame 55, then:
1. Lower the controls fascia. Refer to Frame 57.
2. It is possible to measure the ionisation current with
a voltmeter set at 0-10VDC. (0-10VDC = 0-10 micro
amps ionisation current).
3. With the boiler running, connect a meter between
the terminal marked and earth.
4. Normal reading should be between 4-8V (4-8µA).
5. Replace the electrode if the reading is 3V or below.
6. To replace the ignition/detection electrode, first
7
8
im 2519
remove the jacket front panel. Refer to Frame 57.
7. Pull the HT lead off the electrode.
8. Remove the 2 screws
9. Replace the electrode using the new gasket provided
ensuring that the earth lead is recaptivated under the
screw and washer.
10.Check the electrode gap is 3.5mm.
11. Re-assemble in reverse order.
12.Check the operation of the boiler. Refer to Frame 55.
72
AUTOMATIC AIR VENT REMOVAL
Refer to Frame 55, then:
1. Remove the jacket front panel. Refer to Frame
57.
2. Unscrew the air vent from the self sealing fitting
on the LHS of the flow manifold.
3. Replace the air vent.
4. Ensure that the black plastic vent cap is loose to
allow air to escape. Air in the boiler could cause
damage to the heat exchanger.
5. Reassemble in reverse order.
6. Check the operation of the boiler. Refer to Frame
55.
im5561
2
SERVICING
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