just well publicised warnings about working on them,if you were competent about working on boilers you would know this.my advice was get a competent person to repair or replace.
you need three things for a explosion,
fuel
air
and guess what the third is,yes you got it source of ignition and lo and behold the ht lead is not connected THAT IS THE SOURCE OF IGNITION.to the op leave the boiler alone and get a competent person to repair/replace, that is and should be the only advice given to the op.
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