Central heating radiators going cold downstairs when hot water put on.. Help!!

mikeluxy

Thanks Andrew

Yes |I did try that suggestion of yours but im afraid still no joy....im beginning to think that maybe its just a case that the downstairs rads are just (to put it mildly! Knackered)...they are the originals since the system was installed in the late 80s.

Do you think there comes a time when the lifetime of a radiator has expired....?

mikeluxy

Andrew

Just a follow up....you know your suggestion of switching off all radiators and bleeding one at a time in sequence....just to check im doing it right.... do I fully open the thermostatic valve on the rad to MAX and close the lockshield valve (on the radiator)... or do I not touch the lockshield valve on the radiator....?

Cheers

Mike

mikeluxy

Keystone

Have just unscrewed one of the drain bungs from the downstairs radiator....came out a muddy brown for a few seconds then ran clear....

closed

the rads can't have had it, because they work when hot water heating is off

keystone

mikeluxy wrote: »

Keystone

Have just unscrewed one of the drain bungs from the downstairs radiator....came out a muddy brown for a few seconds then ran clear....

So not black and gungy then - good. Pipework blockage somewhere. I don't think its the rads for one moment now.

Cheers

mikeluxy

Thanks Andrew

I also take it then that the rads which are turned off the TRV valve should be "Off" and the lockshield valve also fully closed and reopened in sequence as I work my way around the Radiators....?

keystone

To add to Andrews suggestion. Just don't open TRVs for the rad you are playing with - take the head off for maximum flow.

Cheers

Canucklehead

Hi,

Just curious, what make of boiler did you have fitted?

GSR

mikeluxy

The Boiler is the Viesman vitodens 100 W

keystone

Mmmm - doesn't that one have a built in circulator? Does that mean you have two circulators on your system?

BTW I'm guess that would be the System Boiler variant?

Cheers