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 50.
3. Unclip the PCB and lift to clear the mounting posts.
4. Fit the new PCB ensuring the 3 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.
51
USER CONTROL PCB REPLACEMENT
3
Potentiometer spindle
Control Knobs (to be in vertical position)
PCB
4
1. Refer to Frame 40.
2. Swing the boiler lower front panel into the service
position. Refer to Frame 34.
3. Remove the 4 xing screws.
4. Disconnect the 4 push on connectors.
5. Remove programmer.
6. Re-t 4 push on connectors to new programmer.
7. Fit programmer and retain with 4 screws previously
removed.
8. Replace the lower front panel.
9. Check operation of the boiler. Refer to Frames 29 &
30.
Note. To program refer to user guide at rear of this
book.
52
REPLACING THE MECHANICAL TIMER
preheat
preheat
min
min
max
mode
reset
off
status burner
max
e
2
4
SERVICING
To Next Page
Loading...
