Potterton Prima 60F not firing up....help please needed

[dazzystar]

Hi All,

As the topic says she won't fire up at all. Not for hot water or central heating. I've reset the programmer in case that was it but still no good. No spark, no fan coming on, nothing. There is power to the PCB though.

Anything I can try?

Cheers
Daz

 

[Elkato531]

Has the overheat stat popped? Little button accessed through a hole in the bottom plastic trim panel. Press it and if you feel a click that should reset it.

If that is the problem, there may be some other problem which has caused the overheat stat to trip. Pump problem perhaps.

 

[Agile]

If the o/h stat has not tripped then you need to see if these is a call for heat voltage on the connections to the boiler!

Some other aspects like gas/combustion aspects would need a gas registered engineer but you could try the above first yourself.

Tony

 

[dazzystar]

If the o/h stat has not tripped then you need to see if these is a call for heat voltage on the connections to the boiler!

Some other aspects like gas/combustion aspects would need a gas registered engineer but you could try the above first yourself.

Tony

Where would I test for voltage for call to heat Tony?

 

[Agile]

You need to unscrew the single screw under the control knob after removing the plastic cover.

Then test to earth from the terminal marked SWL.

Tony

 

[dazzystar]

Installed a new PCB and still the same problem. There is no power on the switched live. The fan makes no attempt to start and there's no power going to it or the CH pump either.

Could it be the air pressure switch?

 

[dazzystar]

I've also tried a new programmer!

The only way of getting the boiler to light is to put a wire between live and switched live.

Anything to test / try?

 

[sooey]

So Tony said to check the switched live, you've got no power to it and you bought a pcb. Why???

 

[dazzystar]

Bought a PCB and a new programmer!

I'm mad! Going to take them both back once I know what's causing the problem.

 

[sooey]

It's not the boiler if there's no switched live, what motorised valves have you got?
You'll be lucky if they'll take the pcb back.

 

[dazzystar]

I have 2 x 2 port Honeywell (I think they're Honeywell) valves

 

[sooey]

If the heating valve was gone it would still fire for hot water and vice versa.
It would be unusual if both valves were gone, but not impossible.
Time to start checking the wiring connections are tight in the junction box if you feel capable without doing yourself in. After that you need a multimeter.

 

[dazzystar]

All wires tight.

 

[dazzystar]

what confuses me is what device sends the call for heat to the boiler?

 

[freeflow]

Have a good look, and check the two orange and the two grey connections from the motorised valves within the wiring centre.