Boiler Switches on while Programmer is set to "off&quot

Dek

Joined
25 Jul 2007
Messages
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Location
Warwickshire
Country
United Kingdom
I have a Ferroli Sigma boiler and a British Gas programmer for the heating and the water. Everything works fine but occasionally when everything is in the off position the boiler fires up. This does not start the heating and does not appear to heat the water. It does not do it all the time but its disconcerting when it suddenly kicks in in the middle of the night. The only way to get it off is to turn the knob on the boiler to the "off" position.
Any help would be appreciated (not too technical please)

Cheers
 
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methinks we are a bit far away from freezing to make the frost stat operate.
must be a plot from bg to sell more gas
 
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I had this; turned out to be a faulty 2-port zone valve (or, rather, a faulty microswitch in the zone valve). I gave the lever a few wiggles and it sorted itself out.
 

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