Note. Fit the earth strap provided with the PCB
to your wrist and a suitable earth on the boiler
chassis.
1. Refer to Frame 51.
2. Remove the main PCB, refer to Frame 61.
3. Unclip the PCB and lift to clear the mounting
posts.
4. Fit the new PCB ensuring the 2 potentiometer
spindles line up with the control knobs which
must be in a vertical position.
5. Reassemble in reverse order.
6. Check operation of the boiler. Refer to Frames
40 & 41.
62
USER CONTROL PCB REPLACEMENT
3
Potentiometer spindle
Control Knobs (to be in vertical position)
PCB
4
63
WATER FLOW SWITCH HEAD REPLACEMENT
1. Refer to Frame 51.
2. Drain the Boiler. See Frame 64, no. 2.
3. Pull off the electrical connection.
4. Turn the retaining collar anti-clockwise and
pull the head from the housing.
5. Fit the new water ow switch head,
ensuring the electrical lead connections
wires point to the right as shown.
6. Re-assemble in reverse order.
7. Re-ll the boiler.
8. Check the operation of the boiler. Refer to
Frames 40 & 41.
3
4
5
SERVICING
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