Perplexed - one for the plumbers

[xcore]

Do the pins in the trvs move down if you apply pressure with then head off? Does either pipe get warm? Re the motorised valve, check there is power to the valve if the hot water is calling, unscrew the head and stick a multimeter on it. The heads are easy to change if it's shot.

 

[GreiginFife]

Do the pins in the trvs move down if you apply pressure with then head off? Does either pipe get warm? Re the motorised valve, check there is power to the valve if the hot water is calling, unscrew the head and stick a multimeter on it. The heads are easy to change if it's shot.

All the TRV pins are fine. At the rads not working the pipes are stone cold.
There is power to the motorised valve. Both of them seeing as there is two.
At one valve the lever has resistance and the other it doesnt.

 

[williamalex1]

All the TRV pins are fine. At the rads not working the pipes are stone cold.
There is power to the motorised valve. Both of them seeing as there is two.
At one valve the lever has resistance and the other it doesnt.

Is the pump running ok?.

 

[GreiginFife]

Is the pump running ok?.

Yeah, tried running it at differing speeds but still no difference.
Cant get anyone out til Tuesday. Need to try and sort it sooner though.

 

[williamalex1]

Yeah, tried running it at differing speeds but still no difference.
Cant get anyone out til Tuesday. Need to try and sort it sooner though.

Did you loosen the big screw on the front of the pump to bleed it. ??

 

[GreiginFife]

Did you loosen the big screw on the front of the pump to bleed it. ??

I didnt, no. Its about the only thing I havent done. Cant understand why its just those 3 rads that are affceted and they are not all together.

 

[williamalex1]

I didnt, no. Its about the only thing I havent done. Cant understand why its just those 3 rads that are affceted and they are not all together.

Could be that gravity is enough to reach some rads , worth a try mate :thup:.

 

[GreiginFife]

Could be that gravity is enough to reach some rads , worth a try mate :thup:.

2 are downstairs and 1 up. Worth a try indeed. Will do it now.

 

[Deleted member 1740]

It wasnt for the other 7 radiators I replaced last year. Hall eas the last one.
Now its tirned in to some sort of riddle.

As before Phil, header tank is full as normal. 6 of 9 radiators are working, albeit not at full capacity but at least working.
Each radiator is also full of water. Some just not getting hot waer and the hot water is now not right.
Cant believe this has come from a straight swap out.

Welcome to the world of plumbing!!

Changing the radiator doesnt take that long, its getting rid of the air lock that does.

I suggest you try and drag the heat through one of the valves on the rads that aren't getting hot.

Turn both valves on the rad off, drain the rad then open a valve and you should get hot water through. Reconnect full and vent. Repeat with the other rads.

Good luck.

 

[GreiginFife]

Welcome to the world of plumbing!!

Changing the radiator doesnt take that long, its getting rid of the air lock that does.

I suggest you try and drag the heat through one of the valves on the rads that aren't getting hot.

Turn both valves on the rad off, drain the rad then open a valve and you should get hot water through. Reconnect full and vent. Repeat with the other rads.

Good luck.

How is best to drain the rad? None have a draincock.
Pump screw done and no air to speak of.

How will draining and refilling each rad help?

Cheers for all the help guys, its frustrating me a little as its the first problem I have had and its just happens to be the very last one to be replaced.

 

[Deleted member 1740]

How is best to drain the rad? None have a draincock.
Pump screw done and no air to speak of.

How will draining and refilling each rad help?

Cheers for all the help guys, its frustrating me a little as its the first problem I have had and its just happens to be the very last one to be replaced.

Either use a builders rubble sack and drain the radiator into bag or empty it into a plastic tub/bucket. Or if you feeling risky snatch it.

 

[GreiginFife]

Either use a builders rubble sack and drain the radiator into bag or empty it into a plastic tub/bucket. Or if you feeling risky snatch it.

I went for snatch it on thw smallest of the 3. Drained it and put it back on, connected up and refilled and bled.... still cold. I am really perplexed now.

 

[Deleted member 1740]

I went for snatch it on thw smallest of the 3. Drained it and put it back on, connected up and refilled and bled.... still cold. I am really perplexed now.

When you drained the radiator, did you open the valve and let water out?

 

[GreiginFife]

When you drained the radiator, did you open the valve and let water out?

Yes, the bleed valve yes.

 

[Deleted member 1740]

Yes, the bleed valve yes.

You're supposed to take the radiator off an drain it through the trv or rad valve. If you do it this way you'll feel the pipe getting hot!

 

[williamalex1]

I hope you get rid of all this trapped air before Dundonald or the Tofs v Whippersnappers, you just might have to swap teams

 

[Hickory_Hacker]

Drama!

Good to see you sticking with this Stuart_C oh and WilliamGoogleAlex as well

 

[GreiginFife]

You're supposed to take the radiator off an drain it through the trv or rad valve. If you do it this way you'll feel the pipe getting hot!

But of I disconnect it before the TRV would water not go squirting from the exposed 8mm pipe?

 

[markyjee]

With the radiator removed open one valve at a time catching water in basin/pot etc to confirm a flow from that pipe, if one side is blocked or air locked rad will still fill from other feed.

 

[Deleted member 1740]

But of I disconnect it before the TRV would water not go squirting from the exposed 8mm pipe?

Turn off trv and rad valve.

Remove radiator off the brackets.

Open the trv and you should get hot water through, if not try the other side and you'll get it through there.

Once you've got hot water to one valve, refit radiator, refill and bleed. You SHOULD have a radiator full of hot water.

Repeat on other rads.