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Mend Potterton Profile 80EL Min 15 Pump

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

Replaced pump (sticking)and heat exchanger (leaked). Since these changes the boiler started short cycling - wasn't doing it before. Problem exist whether set for HW or CH or both. Manufactures engineers carried out work, also was unable to cure problem. System was power flushed before heat exchanger and pump replaced - any ideas?

Mr Cool
January 2013
PottertonPotterton Profile 80ELHeating, Home Heating SystemsMin 15 Pump
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

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