monza heat line 24 and 28 heating PROBLEM

[KEITH WHITTAM]

Hi All

I hope you can help.

The hot water is fine, the heating upstairs is fine, but rads cold down stairs.

We have flushed it through, put cleaner in it and flushed through, have had two heating engineers on it and none of them has fixed the problem.

Pump checked and working, no leaks, system seems clear of blockages.

Can any one help Please, I am not a boiler man and have very little knowledge

Keith

 

[Deleted member 267285]

Do you have separate zones, upstairs and downstairs?

 

[cross thread]

did they go off suddenly or gradually get worse.do they work with upstairs turned off ? if suddenly has anybody turned off any valves .could be the upstairs/downstairs could be run separately and it has a zone valve fitted to isolate downstairs circuit .

 

[Deleted member 221031]

You can get that fault when the return filter is dirty. A quick rinse out and it’s amazing the difference it can make.

That’s if it has one.

 

[KEITH WHITTAM]

Hi Guys
Thanks for the replies.
I don't think it is split, upstairs/down stairs.

The fault happened when one rad was cold down stairs, everything else working, we closed every thing down and flushed it through there was no water restriction through the vales, heat came to it, two hours later was cold again, we put a litre bottle of cleaner through the system the next day we had no heat down stairs, upstairs was very hot, we still the problem despite flushing through and turning rads off and on etc

The boiler was checked and all seems well with that, filters checked and cleaned by the plumber.

You have all helped and I hope you will continue until I fix it, If I new where to press thanks I would
Thanks

Keith

 

[Deleted member 267285]

Thanks on the Bottom right Keith.

Do you have x2 thermostats on the walls? Do you have TRVs on all downstairs rads and have these been checked?

 

[KEITH WHITTAM]

Hi
It only has the thermostat on the boiler, all trv's etc on all rads checked and working, the hot to cold happened straight away it was not gradual

Keith

 

[Deleted member 267285]

And all lockshield valves are open?

 

[KEITH WHITTAM]

I assume they are I think the heating engineer would know that bit ?

If the main hot water pipe sends hot water to the rads and then returns, would the return pipe be hot or cold if it is hot how does it miss the downstairs rads?

Keith

 

[Deleted member 267285]

I assume they are I think the heating engineer would know that bit ?

If the main hot water pipe sends hot water to the rads and then returns, would the return pipe be hot or cold if it is hot how does it miss the downstairs rads?

Keith

It might have been overlooked by the heating engineer. Flow pipe should be hotter than return pipe. It would miss downstairs on the principal that if the flow is open but return is closed, then there is nowhere for the water to be flowed to.

 

[KEITH WHITTAM]

ok thanks I will give it a try tomorrow when I go down and will let you know of any progress

Keith

 

[ianmcd]

Flow pipe shouldn’t be hotter than return pipe

You might want to rethink that one mate

 

[Deleted member 267285]

You might want to rethink that one mate

I typed should be, feckin iPad and auto correct

 

[Deleted member 267285]

Keith just to clarify, I’ve now edited my post, the flow pipe should be hotter than the return pipe, iPad changed on autocorrect.

 

[KEITH WHITTAM]

yes it is but prior to messing about with everything it was cold

Keith