Note. Fit the earth strap provided with the PCB to your
wrist and a suitable earth on the boiler chassis.
1. Refer to Frame 40.
2. Remove the main PCB, refer to Frame 51.
3. Unclip the PCB and lift to clear the mounting posts.
4. Fit the new PCB ensuring the 4 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 29 &
30.
52
USER CONTROL PCB REPLACEMENT
3
Potentiometer spindle
Control Knobs (to be in vertical position)
PCB
4
1. Remove the boiler front panel. Refer to Frame 34.
2. Pull out the plate with timer attached.
3. Disconnect 5 way connector.
4. Remove programmer and t new programmer
5. Re-t 5 way connector.
6. Push t mechanical timer into housing
7. Replace the front panel ensuring a good seal is made.
8. Check operation of the boiler. Refer to Frames 29 & 30.
Note. To program refer to user guide at rear of this book.
53
REPLACING THE MECHANICAL TIMER
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