Not a sw problem , a 47nF ,400V 1960s type yelowish cement cased poly cap
over a th/sw contacts was s/c. Had me bamboozled for a time.
So 2 n/o 58C th/sw in parallel for fan operation and 2 100C n/c th/sw in
series for cut out. Can power up now having sorted that conundrum out.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/