Central heating OFF but radiators emit tepid heat

[Mutley56]

I have read various posts about others' similar problems but don't really understand the answers. Apologies therefore if the answer lies within replies to those posts.

In my case I have programmed the gas condensing boiler, installed with all plumbing 2 years ago, to heat hot water for 1 hour twice per day. At that time, the radiators heat up to a tepid temperature. Is that normal?

The system comprises a Worcester Bosch Greenstar gas condensing boiler. Megaflo unvented hot water cylinder, 9 radiators with copper piping throughout.

Thanks for your advice.

Mutley56.

 

[kevplumb]

check the heating zone valve/s View media item 11148

 

[Mutley56]

Hi kevplumb,

I will locate the part, but what should I check / look or listen out for when the boiler is on?

Thanks for your adivce.

Mutley56

 

[kevplumb]

if hot water only is selected check the pipes either side are not heating

 

[Mutley56]

There are 2 of these valves near the boiler. I will check them when I get home and update this post with what I find.

Thanks again.

Mutley56

 

[Mutley56]

I have uploaded a picture of the pipework.

The pipework is hot to touch either side of the lower valve to the left side of the picture.

The pipework is warm to the touch on the left hand side of the other valve and tepid on the right side of that valve.

Each valve is a honeywell one and has a slider, which is set to Auto.

Any ideas if this is correct?

Many thanks.

Mutley56 View media item 26076

 

[seco services]

would say it passing then.

 

[Mutley56]

Good evening seco services,

I'm sorry but I don't understand your reply.

Mutley56

 

[seco services]

letting water by when it shouldn't be.

 

[Mutley56]

Thanks for that seco services. Are you referring to the lower valve in the left hand side of the picture, or the other one that has the warm / tepid pipe temperature? Presumably the valve can be replaced at the next boiler service?

Thank you for your continued interest.

Mutley56

 

[seco services]

the one thats tepid must be your heating valve and letting by.

if the lower one is hot and you have your hw on only then thats your hw one and upper one is heating valve.

can't really tell by the pic.

 

[Mutley56]

That's exactly how it is. The upper one must be the heating valve as the lower one is hot either side of the valve now that the boiler is heating the hot water. The central heating is, and has been, turned off for months now.

I'll ask for the valve to be replaced when the boiler and unvented cylinder are serviced later this year.

Thanks everyone for you value advice.

Mutley56