57
PUMP HEAD REPLACEMENT
1. Refer to Frame 41.
2. Drain the boiler. Refer to Frame 53.
3. Disconnect the electrical lead from the pump.
4. Remove the 4 Allen screws retaining the pump head.
5. Remove the pump head.
6. Fit the new pump head.
7. Reassemble in reverse order.
8. Rell the boiler. Refer to Frame 23.
9. Check operation of the boiler. Refer to Frames 30 & 31.
3
4
5
58
CH WATER PRESSURE SENSOR REPLACEMENT
1. Refer to Frame 41.
2. Drain the boiler. Refer to frame 53.
3. Remove condensate trap/siphon. Refer to
Frame 50.
4. Using a suitable tool pull out the retaining clip.
5. Pull the pressure sensor upwards to remove.
6. Unplug the electrical connection and transfer
to the new pressure sensor.
7. Push the new pressure sensor onto the rear
pump housing and t retaining clip.
8. Reassemble in reverse order.
9. Rell the boiler. Refer to Frame 23.
10. Check Operation of the boiler. Refer to
Frames 30 & 31.
6
4
1. Refer to Frame 41.
2. Drain down the boiler. Refer to Frame 53.
3. Unplug the electrical lead.
4. Unscrew the thermistor (to facilitate removal a
13mm socket spanner should be used).
5. Fit the new thermistor using the sealing washer
provided.
6. Reassemble in the reverse order.
7. Rell the boiler. Refer to Frame 23.
8. Check the operation of the boiler. Refer to Frames
30 & 31.
59
CONTROL / NO FLOW THERMISTOR REPLACEMENT
4
3
SERVICING
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