Have you tried replacing the mercury vapour switch? My boiler died and this was the problem. Mind you, they're expensive - £93 + VAT but easy to fit. You can get one from Curzon Components of Eastleigh 02380 650626 or Central Heating Spares, Camberley 01276 35223. But get in quick. They're out of production - only a few left.
Lindsay Ferguson
November 2005
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