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what's wrong with my boiler?

i have a worcester/bosch 24i junior. when its switched on it makes a trickling sound (like something filling up) and then the pilot tries to fire and it booms. it does this a few times then goes into error...
john, April 2009
check electrode gap, it should be 3 to 4 mm, have you service the boiler.

Mr K, April 2009
link Click here to see other fixes for Bosch.