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potterton performa?

I HAVE JUST HAD A NEW PCB AND AN AIR PRESSURE SWITCH FITTED BUT MY BOILER STILL DOES NOT WORK ...IT COMES ON WHEN THE COMBUSTION COVER IS OFF BUT WHEN THE COVER IS PUT ON IT GOES OUT AGAIN ..MY PLUMBER HAS RUN OUT OF IDEAS.....CAN ANYONE HELP???
JACKIE, April 2008
try replacing venturi in fan

iain, April 2008
link Click here to see other fixes for Potterton.