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Dave Think between us we've sussed it..!! Whilst the top bit was off I pushed on the valve "plunger" and hey presto, it slid out into what i suspect is the closed position. So your expert diagnosis was correct. The valve was stuck open. I have remounted the top bit and the boiler...

Just managed to "dis-mount" the valve in question. Push a button and turn. It is a Honeywell Double Insulated Actuator - VC4613 Just so I can understand the problem better... What is it that this unit actually does..? Cheers Mark

Dave, I never thought you were referring to me as an idiot as I know these unvented systems are all tied up with regs. To be honest I struggle to find a suitably qualifed plumber in my area to come and service the damn thing..!! I could do with checking for the live wire first, I'll get...

OK, I think I can see the valve you are referring to. Does all this unit have to be replaced, or can just the top plastic bit be replaced..? Is it a DIY job..? (I am not an idiot when it comes to using spanners, did a 4 year engineering apprenticeship...) How much are the parts...

Hi mate, Thanks for the quick reply... much appreciated... OK here goes... In the garage is an Ideal Classic boiler with a pump situated above it In the airing cupboard is a Telford Tornado cylinder which is a mains pressure and indirect. Attached to this is a temperature control...

Hello, I appear to be having a problem with my hot water. I noticed today that the water is hotter than the temperature set on the sensor. I set it at 55 and the gauge on the cylinder reads 65. After looking into this in a bit more detail it seems like the hot water is on all the time...