I have central heating but no hot water

[Kotek Besar]

My central heating is working, but I have no hot water.


My boiler is an ideal logic heat 15. I have hive active heating.


When I turn the central heating on in the Hive app, the hive receiver calls for central heating and the boiler fires up. It is working correctly.


When I turn the hot water on in the Hive app, the hive receiver calls for hot water but the boiler does not respond. It remains in standby mode.


I read online that the issue may be a problem with the 2/3 motorised valve in the airing cupboard. Mine is a danfoss hsa3. So I just bought a new one and replaced it like for like. But the issue remains.


Any advice welcome.

 

[townfanjon]

You need to find out of your cylinder stat is “ getting a live “ , has anybody knocked it , is it an unvented cylinder?

 

[Riley]

Or the two/three port valve

 

[Kotek Besar]

You need to find out of your cylinder stat is “ getting a live “ , has anybody knocked it , is it an unvented cylinder?

Thanks for replying. How can I check if it is getting a live? I don’t believe it has been knocked recently, but I suppose it is a possibility. I’m sorry, I don’t know what unvented means.

 

[Riley]

Do you know how to use a multimeter? If not you’ll need a heating engineer out

 

[Kotek Besar]

Do you know how to use a multimeter? If not you’ll need a heating engineer out

Afraid not. There is a plumber who I usually use to service my boiler and to be honest it is due a service this month so I could call him to do both at the same time. But, from what you’ve said, is it a plumber I need an electrician?

 

[townfanjon]

Thanks for replying. How can I check if it is getting a live? I don’t believe it has been knocked recently, but I suppose it is a possibility. I’m sorry, I don’t know what unvented means.

You would need to know how to use an electrical tester.
The “unvented”bit is a pressurised water cylinder which is fitted to most new build houses these days , you may have an older type “vented “cylinder .

 

[Riley]

Either way I’d get your man in

 

[Kotek Besar]

Thanks everybody. I will get my man in.

I actually electrocuted myself today changing the Danfoss unit over. I isolated the electrical circuit on the fuse board that is labelled “water heater” but it was still live! An electric shock later, I went back downstairs and isolated the mains completely before going back upstairs to finish the job. Of course, it was all in vain as the issue remains!

 

[Riley]

Good choice to get someone in