Keston Combi 30 - User Control Pcb Replacement

48
SERVICING
Keston Combi - Installation and Servicing
Note. Fit the earth strap provided with the PCB
to your wrist and a suitable earth on the boiler
chassis.
1. Refer to Frame 45.
2. Remove the main PCB, refer to Frame 57.
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 Frame
36.
58 USER CONTROL PCB REPLACEMENT
3
59 DHW FLOW TURBINE SENSOR REPLACEMENT
1. Refer to Frame 45.
2. Remove condensate trap/siphon. Refer
to Frame 56.
3. Lift off the ow turbine sensor plastic
retaining clip.
4. Unplug the electrical connection and
transfer to new turbine sensor.
5. Reassemble in reverse order.
6. Check operation of the boiler. Refer to
Frame 36.
3
4
Potentiometer spindle
Control Knobs (to be in vertical position)
PCB
4
SERVICING
207895-2.indd 48 02/01/2013 09:38:44