Downstairs rads cool

[Neiledward]

Problem is that the downstairs rads are not getting hot enough they get warm at best and can't get the temp at thermosat location in hall above 15 oC.

Return pipework from ground floor is normally very cool. Done some basic things and checks, Pump appears to be working, done some cleaning out by adding chemicals and draining down. Not sure if one of the motorisd valves is working as there is no resistance when pushing it accross to the manual side (as there is with the other m valve), although the pipewrk either side of the valve is hot. Could the MV be the problem or any other clues ?

 

[weareleeds]

Pump not fast enough or blockage in system

 

[D_Hailsham]

Not sure if one of the motorised valves is working as there is no resistance when pushing it across to the manual side (as there is with the other m valve), although the pipework either side of the valve is hot.

You will feel resistance when the valve is closed and no resistance when the valve is open.

Is one MV in the heating circuit and the other in the hot water circuit or are they both in heating circuits?

What happens when you turn the room thermostat right down? If you get resistance, that shows the valve is opening and closing properly.

 

[Neiledward]

The lever on the MV will move back and forth without any resistance (unlike the other one)
Both valves on same pipe, one on on the junction of the by pass and the other anly a few inches away just before the primary flow enters the cylinder.

Currently draining down to see what condition of water is and quite frankly it appears very clear with only one or two bursts of dirtier water.

Any other thoughts on the valve or anything else will be gratefully recieved

 

[Neiledward]

Also, I should mention that turning the thermostat down makes no difference.

Picking up on comment about pump not fast enough, what might be problem here ? the pump does appear to be working and system has worked satisfactorily in the past, any other thoughts ?

 

[D_Hailsham]

Both valves on same pipe, one on on the junction of the by pass and the other only a few inches away just before the primary flow enters the cylinder.

Can you post a photo showing both valves and the surrounding pipework - not a close-up as the layout is important.

It's not clear which valve has no resistance.

 

[Neiledward]

Untitled

• Neiledward
• 30 Dec 2008
• 1

Thanks for help so far, the suspect valve is the 3 way valve shown.