Wiring diagram for Vokera Excell 80 SP8?

Your boiler's fan is meant to run all the time, fast when the burners are alight and slow when only the pilot is lit. If the fan doesn't slow run you have a fault; the pilot will occasionally suffocate and go out. The underlying problem in such cases could be a safety issue if caused by the boiler flow switch failing. Ask a qualified corgi man.
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March 2009