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im really a complete novice at all this, technical words like chocked and next to the block mean nothing im afraid, i couldnt locate the expansion vessel if i tried, thanks anyway,

hi , the boiler does turn off completely once the pressure reaches the highest point in the red, then once its cooled down a little it turns back on for only about a minute before turning off again cos pressure has shot up again,, one other thing i forgot to mention, is that none of the...

Hi, can anyone tell me why the pressure gauge on my saunier duval thema F23E boiler shoots up to over 3 in the red then cuts out completely, it has been working fine for last 4 years, no problems, it came on ok by timer yesterday, did its business till mid day, but when i went to flick it on...