I have a potterton profile 80el short cycling 1 min 'off' 1.5 min'on'?

It is switching off prematurely when a certain internal temperature is reached. As the internal temperature drops then conditions are reached that enable it to come on again.

I just guess.

A bizarre bad connection issue with internal wiring or the control electronics? Some problem with the fan/air pressure switch combination - being "on-the-edge" - good enough to work at lower temperatures but not when warmer.

What is the fan doing when it shuts off?
What is the Air Pressure Switch doing?

Peccavi
January 2013