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my vokera boiler excell 80 will not start?

my boiler will not operate,the pump and fan run and it seems like it will srart but does not
john kin, July 2010
2: could also be the flow microswitch

noname, July 2010
Two initial possiblities:
1: Fan pressure switch not opening.
2: Pump (when running) operates a microswitch on the diverter (a small diaphragm may have failed).

Carefree, July 2010
link Click here to see other fixes for Vokera Excell 80.