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  1. M

    boiler won`t switch off.

    been checking through fault diagram in manual. i have continuity across terminals 31 and 32 at pcb m7 with power off. does suggest pcb relay faulty?
  2. M

    boiler won`t switch off.

    blue and brown wires disconnected from ignition pcb. green wires on dhw switch on "c" and "no". with green wires disconnected boiler still operates. only thing that turns boiler off if dhw stat turned to approx 1/4 or less or red wire removed from primary switch.
  3. M

    boiler won`t switch off.

    yes thanks for that, quick update. 3 pins on both switches, only 2 wires, 1 and 3 connected, red on primary green on dhw. wiggling had no effect disconnected ignition wire at pcb( ignition) now when powered up the following symptoms; boiler lights immediately. no clicking from ignition...
  4. M

    Steering wheel wobble but wheels are balanced.

    if you can drive through the problem i.e. no wobble after 40 or 50mph it is wheel balancing. take it back and ask them to do it again, properly. malc
  5. M

    boiler won`t switch off.

    before i altered them the 2 red wires were on the primary, the 2 green on dhw. the switches have three connections. will check wiring diagram later, off to work now. thanks for help fellas will let you know outcome tomorrow. malc
  6. M

    boiler won`t switch off.

    both micro switches are 3 connection. tried swapping as suggested and the result was.; boiler did not light when power switched on although primary pin operated switch. no ch when external stat asked for heat. dhw worked as should . is it possible some idiot (me) has got micro switch...
  7. M

    boiler won`t switch off.

    hi Tony, yes if i hold down primary pin manually, dhw works as it should i.e. lights and extinguishes boiler by turning taps on and off. but obviously no ch. as soon as pin released burner lights and stays alight.
  8. M

    boiler won`t switch off.

    thanks Dave, will give that a go when I get in tonight, I notice there is an ignition pcb fitted. might be worth investigating that.if its a separate unit which appears to be on the wiring diagram. thanks malc
  9. M

    boiler won`t switch off.

    yes def "p" model. the only time i have just pilot is with power off. as soon as power switched on boiler lights fan full speed and boiler flat out. can`t adjust flame with manual ch or dhw stats on front of boiler also constant sparking from pilot ignition unit.pressure rises until power...
  10. M

    boiler won`t switch off.

    thanks Dave, will persevere and let you know. thanks for pointers.
  11. M

    boiler won`t switch off.

    just realised, when boiler is lit the pilot light ignition is constantly sparking. any clues?
  12. M

    boiler won`t switch off.

    thanks dave, only other thing can think of is weak/damaged spring in divertor, still does not make much sense?
  13. M

    boiler won`t switch off.

    starting to think it must be pcb faulty, anyone know test procedure? i have multimeter .
  14. M

    boiler won`t switch off.

    no demand from external stat, with primary flow switch disconnected(red wires) boiler does not light, although pump runs and primary spindle operates switch, no dhw either. with p/flow switch connected and plunger held down manually, dhw works, i.e. turn on tap and boiler lights.
  15. M

    boiler won`t switch off.

    sorry Tony, forgot to mention. have pressure drop in system,have to re pressurise every 2 to three days, but can`t find any evidence of leak.
  16. M

    boiler won`t switch off.

    hi, disconnected switch, boiler still lights immediately.
  17. M

    boiler won`t switch off.

    Hi, Hope someone could help with my heating problem. i have an alpha 240p boiler thats constantly calling for heat, as soon as i switch the power on the pump starts, the primary flow switch operates and the boiler lights. it then stays on until switched off at wall. also pressure rises...
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