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POSSIBLE AIR LOCK IN BOILER?

I had a problem with a leak in one rad - turn boiler off - drained all rads - fixed rad with leak - refilled system - boiler came on & after 5 mins switched off (on it's own) - tried re-lighting boiler no luck - could there be an air lock inside boiler or something else!
boiler: potterton 100e
max, October 2006
AIR IN BOILER OR TRY BLEEDING THE PUMP.IF AIR TRAPPED IN PUMP THE WATER IN BOILER WON'T CIRCULATE AND THE BOILER WILL OVER HEAT AND TRIP.

HI-SPEC PLUMBING, October 2006
link Click here to see other fixes for Potterton 100e.