Upstairs hot, downstairs cold

[Fozza46]

Hello everyone,

Having had some great advice on here before I thought I'd try again.

Our upstairs radiators are working fine but none of our downstairs ones are warm. They worked for a bit after we started using the heating after the summer downtime but we had the heating off for a couple of days and now they won't warm up.

There are two pipes leading to the radiators. The one leading to the thermostatic valve gets warm for a bit but then seems to cool without heating up the radiator. The other pipe stays cold.

I tried bleeding the radiators and there's no air in the system as far as I can make out.

Can anyone suggest what may be wrong?

Any advice would be very helpful. Thank you in advance.

 

[HERTS P&D]

Turn off the hots radiators and see if the cold radiators get hot.

Andy

 

[Fozza46]

Thank you for your reply.

I've shut off the upstairs radiators. The downstairs radiators are hot at the top but are either cold or tepid at the bottom.

 

[HERTS P&D]

System needs flushing out, do a chemical clean or remove the rads and flush with a hose pipe in the garden.

Andy

 

[Fozza46]

Thank you for your reply.

I think a job like that would be beyond me.

How much would someone charge to do a job like this?

I really appreciate your help.

Thank you.

 

[neiltheplumber]

£600.