Mum had boiler serviced today. Called me a few hours later as boiling water coming out of an overflow. Had a look in loft and it's gushing from vent pipe into heating header tank.
It's an old gloworm hideaway, with pumped heating and gravity hot water, no tank stat.
After a bit of "fault finding" I realised that the cylinder was boiling because nothing was turning the boiler off when the heating was on but satisfied - I'm thinking this is down to the boiler stat?? I turned this to "off" and the boiler carried on running!! - removed the stat from its mount and had a waggle - don't know whether it was the electrical connections or the copper tube but it suddenly started working, I put it back and it seems ok for now - I don't know how these work or fail but I suppose it's reasonable to need a replacement after 25 years? I haven't said anything to the engineer as I presume he may have just disturbed it a bit or something and this was just the final straw for it? - and he's actually a mate of mine.
It's an old gloworm hideaway, with pumped heating and gravity hot water, no tank stat.
After a bit of "fault finding" I realised that the cylinder was boiling because nothing was turning the boiler off when the heating was on but satisfied - I'm thinking this is down to the boiler stat?? I turned this to "off" and the boiler carried on running!! - removed the stat from its mount and had a waggle - don't know whether it was the electrical connections or the copper tube but it suddenly started working, I put it back and it seems ok for now - I don't know how these work or fail but I suppose it's reasonable to need a replacement after 25 years? I haven't said anything to the engineer as I presume he may have just disturbed it a bit or something and this was just the final straw for it? - and he's actually a mate of mine.