Potterton Prima F 60F - Air Pressure????

[twgas]

if the fan cycles on and off every few seconds its almost certainly the pcb.

 

[waynedance]

hi, thank you for your reply.

What is the PCB?
This is linked to it not starting from cold and having to clamp the red pipe.

Are these plug and play, seen them on ebay for £30. This is located under the boiler so no need to remove the main panel.

 

[Ian100]

Apologies if this is all history now. I just joined DIYnot and have not figured out how the threads work or how old they are.
I have a Prima 60F, fan cycles as described above. The fault is the APS (pressure switch) which has open circuit NO contacts on the microswitch. The diaphram and switch assembly all comes as one part - v. expensive. Easy to remove and refit though. Fingers crossed...I'll befitting the replacement tonight.

 

[Jaredtuck]

Apologies if this is all history now. I just joined DIYnot and have not figured out how the threads work or how old they are.
I have a Prima 60F, fan cycles as described above. The fault is the APS (pressure switch) which has open circuit NO contacts on the microswitch. The diaphram and switch assembly all comes as one part - v. expensive. Easy to remove and refit though. Fingers crossed...I'll befitting the replacement tonight.