Heating stays on

[Happydays]

When my central heating is turned of the rads stay on up stairs, they only go off when i turn the hot water off.

I have a baxi 551 back boiler and one of those round dial timers. (timer to the right and 2 switches c/h top h/w bottom) Theres also a therm control on the wall in the living room but that only seems to control the heating down stairs.

I am a bit by this.

I would be greatfull for any help.

 

[JohnD]

Hot water (supplied for the HW cylinder) is escaping round the CH pipes.

If you have an electric valve (3-way or similar) it might be worn out.

Is your system fully pumped, or gravity feed to the cylinder?

If you post a few pics of the pump, valves and pipes round the cylinder we may recognise it.

A Baxi back boiler suggests quite an old system. Has it recently started doing this, or as long as you've lived there?

 

[ChrisR]

There's an ex Servowarm system 300 metres from me which was "designed" like that. Upstairs rads always come on with the HW!

 

[weareleeds]

Sounds to me like gravity system with faulty or missing null flow valve (or dumb ball) whatever you call them

 

[Happydays]

Is your system fully pumped, or gravity feed to the cylinder?

The answer to that is pass ain't got a clue

What am i looking for and how do i find out? That also applies to the elec
valve.

Been in the house about a year and its always been same, thought its about time i found out if it should be like that![/quote]

 

[kevplumb]

Sounds to me like gravity system with faulty or missing null flow valve (or dumb ball) whatever you call them

anti gravity valve

 

[JohnD]

have a look at

//wiki.diynot.com/plumbing:heating_systems

and

//www.diynot.com/forums/viewtopic.php?t=37170

 

[Happydays]

Thanks, i'll have alook at those.

Have to be later as i am in the process of trying to fill a bath using a kettle and sauce pans as the boiler still wont light.

refering to previous post