Gravity fed problems. Hot water on only - Radiators hot

[pele35uk]

Hi
I have a 15 year old gravity fed system. When i put on the hot water only, the radiators get very hot and the hot water gets used up. I had both the radiators on and the hot water on and the house got very hot. i turned the room thermostat down to 10c but the radiators stayed very hot.

Please help

Thanks

Glenn

 

[namsag]

On the heating flow pipe there should be an anti gravity valve it is usually within a few feet of boiler, looks like a brass socket . This is sticking and allowing water around heating circuit. Needs changing

 

[Nige F]

or tapping with a Brummie screwdriver..(hammer)

 

[chaps]

is it all the rads or just upstairs ones, if so get ya brummie screwdriver to hand

 

[kevplumb]

brummie screwdriver

if not you need a 9/16ths long pattern open ended hammer

 

[pele35uk]

Thanks for the replies - All Rads Heat up

 

[pele35uk]

oh yeh
forgot to say
The system is gravity fed but is a fully pumped system.
Does this make a difference??
Somebody mentioned to me could be wired up wrong??
Thanks

 

[chaps]

wired up wrong ide say either that or your control valve is letting heat by/stuck open, it will be a three port or 2x two ports

 

[jonseyrs]

If this problem has only occured recently and no work has been carried out on the system recently then a 2-port or 3-port valve is probably faulty.
If the system has been doing it for 15 years then the system is wired up wrong or piped up wrong.

 

[Soggy_weetabix]

or tapping with a Brummie screwdriver..(hammer)

Or your apprentice when youve had a day like mine with him (or her)

David

 

[pele35uk]

Thanks all
Will let u know

 

[gas4you]

Most old systems on gravity would have the roomstat contoling the pump directly