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pilot light?

reignite pilot light worcester 230 combi boiler
A G Brain, April 2016
The pilot flame on modern boilers only lights when there's a call for heat - it does not stay on all the time.

First the fan runs - then a pressure switch senses that the fan's running OK then the pilot flame is ignited.

I am not a boiler engineer - mere conjecture.

Call for a specialist is my advice...

Good Luck..., April 2016
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