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Potterton puma 80pp?

have fitted new fan assembly worked fine for two weeks,then new control board,then new HW flow switch, then hw temperature sensor,will now work if you bump the frame but can only get it to burn for 30 seconds ( main burner??) HELP ANY ADVICE??
Alan, March 2011
Answer was that the plastic pipe at the air pressure switch had split.

asrobs, May 2011
only thing to change is gas valve one of selonoid jam up it job for GASSAFE Registar engineer

lal, April 2011
check fan pressure switch if that's ok then check cables, connections and pcb for dry joints

brian, March 2011
link Click here to see other fixes for Potterton.