Issue with 1 rad not getting hot | Central Heating Forum | Plumbers Forums
  • Welcome to PlumbersTalk.net

    Welcome to Plumbers' Talk | The new domain for UKPF / Plumbers Forums. Login with your existing details they should all work fine. Please checkout the PT Updates Forum

Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws

American Visitor?

Hey friend, we're detecting that you're an American visitor and want to thank you for coming to PlumbersTalk.net - Here is a link to the American Plumbing Forum. Though if you post in any other forum from your computer / phone it'll be marked with a little american flag so that other users can help from your neck of the woods. We hope this helps. And thanks once again.

Discuss Issue with 1 rad not getting hot in the Central Heating Forum area at Plumbers Forums

Messages
4
Hi all,

I moved into a 3 bed detached property June 2018, turned the heating on in the October and found the living room rad didnt come on. The system is not a combi boiler, i have an emersion heater upstairs, it does have a magnetic filter next to the boiler.

I drained some water out of the rad and a small amount of dirty water came out and this kicked the rad into life. Since then all has been ok. Until...

All rads apart from the living room and hallway had TRV's on them. I had a plumber come out and change the hallway and living room valves for TRV's, install a new rad in the upstairs bathroom and carry out a service on the boiler. I had also asked for a flush of the system given I was aware some dirt came out when id drained some of the water in the previous year

A few hours after he left I noticed the living room rad didn't work, he came back out and spent 2 hours trying to get it running. In the end he drained most of the water out of it and let it fill back up and it started working. He said the flush wasn't warranted as both the fluid that came of the rad and the magnetic filter were fairly clean.

Since then it has worked on and off over the last 2 weeks.

First he suggested the pump was perhaps coming to the end of its useful life and to change that, but then back tracked and said the likely cause was the mircobore pipe feeding the rads and the living room being the last in the system.

I have since tried to balance the system, each time it goes off and by turning off the rads upstairs and the hallway, it kicks the living room back into life. I have opened the upstairs and hallway a 1/4 turn, starting with the furthest away from the boiler in the hope that would balance it correctly but I'm still having issues with the living rad generally stopping over night.

I have also noticed a faint periodic pulsing coming from the back of the house, which is where the boiler is located, when the central heating is on that wasn't there before. I haven't been able to pinpoint where the noise is coming from but its not obvious that its coming from the pump itself or the boiler. It sounds like its where the water is being pumped through the pipes to upstairs which is at the back of the house.

I really want to know what my options are. I'm happy to replace the pump and I'm happy to have the system flushed but are both required? From what I've read its generally obvious when the pump it defective as it will either leak or your hear it.

TIA for any advice
 
have you tried the pepper pig approach? Turn off every radiator at both ends...switch heating to high....open FULLY the lockshield and TRV of the rad in question. Leave it for 30-45 minutes......let it get red hot...you should hear air back at the boiler.....Once running as it should, then do the balancing once again
 
have you tried the pepper pig approach? Turn off every radiator at both ends...switch heating to high....open FULLY the lockshield and TRV of the rad in question. Leave it for 30-45 minutes....let it get red hot...you should hear air back at the boiler...Once running as it should, then do the balancing once again

Not tried this but certainly will give it a go. May i ask where the Peppa Pig reference comes from?
 

Similar plumbing topics

You seem to have got it sorted, but for future...
Replies
7
Views
945
It is set to that, max output, CC3 at 6.5M...
Replies
19
Views
2K
1/4 turn black knob on both. open bleed screw...
Replies
7
Views
833
Since it became normal for trv's to be bi...
Replies
1
Views
584
A simple thing i'd probably check is the...
Replies
9
Views
1K
Back
Top