Boiler: Baxi WM 51/3RS
Prog: Potterton EP3001
Pump: Grundfos ups 16-60
M-Valve: Sunvic SD 2701
7 Rads all with TRV
3 bed semi with Hot Water Tank.
=================
Last week the downstairs radiators stopped working all of a sudden.
I did the normal easy thing and bleed all radiators but to no avail.
I checked the pump (opened the screw, popped a screwdriver in it and it is running)
Turned the the pump from 2 to 3. Speed increased but still no heating downstairs.
Next I turned the upstairs rads off and the downstairs rads came on!
I rang a heating engineer up and he said if the pump is running it is probably sludge build up. (i have however flushed out every rad in the last 4 years when decorating)
He recommended SM4 Sludge Remover. So I drained the system, added the SM4 to the header tank, ran the CH for a week then drained the CH until the water ran clear (took about an hour). Filled the system back up with water and inhibitor (SM1) and bleed all the radiators.
However, as you have probably guessed it has made no difference. The rads are still cold downstairs if the upstairs are on. Even the pipes feeding the TRV's downstairs don't get hot until the upstairs rads are turned off.
Also, the larger rads downstairs don't get exactly red hot and they are colder at the bottom.
Can the pump be failing to 'pump enough' even if it is running?
Any ideas?
Prog: Potterton EP3001
Pump: Grundfos ups 16-60
M-Valve: Sunvic SD 2701
7 Rads all with TRV
3 bed semi with Hot Water Tank.
=================
Last week the downstairs radiators stopped working all of a sudden.
I did the normal easy thing and bleed all radiators but to no avail.
I checked the pump (opened the screw, popped a screwdriver in it and it is running)
Turned the the pump from 2 to 3. Speed increased but still no heating downstairs.
Next I turned the upstairs rads off and the downstairs rads came on!
I rang a heating engineer up and he said if the pump is running it is probably sludge build up. (i have however flushed out every rad in the last 4 years when decorating)
He recommended SM4 Sludge Remover. So I drained the system, added the SM4 to the header tank, ran the CH for a week then drained the CH until the water ran clear (took about an hour). Filled the system back up with water and inhibitor (SM1) and bleed all the radiators.
However, as you have probably guessed it has made no difference. The rads are still cold downstairs if the upstairs are on. Even the pipes feeding the TRV's downstairs don't get hot until the upstairs rads are turned off.
Also, the larger rads downstairs don't get exactly red hot and they are colder at the bottom.
Can the pump be failing to 'pump enough' even if it is running?
Any ideas?