Last two radiators not heating

[Alal Uddin]

The fact you mention it helps when you turn a couple of rads off then this would suggest that it is not balanced correctley. I know you have balanced the system but it does sound like a balancing problem if turning off another rad solves the problem.

I thought it was balanced. The last plumber closed all the radiators and got the last to rads working. He then opened all other radiators by half a turn. Is that not balancing?

 

[Gazzzz101]

Try isolating every radiator apart from the two in question and leave the heating to run for 15 mins in this way, then open back up one by one.

 

[Daniel Hall]

How about get a plumber out to investigate it properly instead of asking us how to do it then doing it yourself?

 

[Alal Uddin]

Try isolating every radiator apart from the two in question and leave the heating to run for 15 mins in this way, then open back up one by one.

I think we have already tried this but I shall give it another try and see what happens. Thank you for the suggestion.

 

[Alal Uddin]

How about get a plumber out to investigate it properly instead of asking us how to do it then doing it yourself?

I came to this forum after going to many different plumbers and spending a fortune to try and resolve this. I had British Gas cover for over 6 years. I cancelled with them because they couldn't resolve this issue and kept on hiding behind their extortionate power flush service. I have had a power flush done by a power flush specialist but it did not resolved the issue and British Gas refused to accept that a power flush was done even though it was certified by the power flush association. I am only on this forum because plumbers tend to come and show me they've done something and take my money but I am still left with the issue but never get a refund! I hope that answers your question!

 

[Best]

Get a decent heating engineer to remove the 2 radiators and firstly flush them out and then open each valve into a hose to flush each pipe and confirm the flow is good and remains constant.
This needs done with all other radiators turned off, so not to have a blocked flow pipe feeding from another radiator return, for example.
You might have better luck with an independent engineer, rather than asking the big companies to send out just anybody.