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Thanks @Rodders53 for all of those points. In particular, I think it could be worth trying to figure out if something connected to it is drawing the power. If I do manage to get to the bottom of it, I will report back here.

Thanks @flameport, I will try to see if there is anything connected to the grey box that is drawing the power..

Thanks @ericmark. When I turn off the power switch on the wall controller, there is an immediate electricity usage drop of around 400w that can be seen through the app I use. When I tun it back on again, it goes right back up.

Thanks @Rodders53. The readings I am getting are not from an IHD, but from an app that came with our PV solar panel system. This monitors current load on the house (as well as details on the solar PV system). When I switch off the UFH control unit, the app shows in real time a drop of around...

Thanks @Why Not Indeed . The system is actually wet UFH, with an air-to-water heatpump. Probably will, but I am trying to figure out what the problem is so that the person can fix it. I spoke to the service guy by telephone and he couldn't understand what might be happening, so just trying to...

Thanks @EFLImpudence for your reply. Sorry if I'm getting terminology mixed up. Around 600w is being used constantly, with around 400W of that appearing to be drawn by the underfloor heating controls. I am able to see the usage through an app that I have that shows the electrical load on the...

I have an underfloor heating system in my house. It is Alpha Innotec, installed in 2006 and it normally works ok. In the last year or so, I have an app that shows current electricity usage (load) of the house. This shows me that the house is using about 600w per hour at night or when the house...

Sorry, details of the system below: Alpha Innotec 12 KW Air-to-water Heatpump, 230v / 1NPE / 50Hz LW 120M-A/XS 1NPE 230 VAC 50Hz

Hi, If anyone can help me I would be very grateful... I have an air-to-water heatpump that supplies me with hot water and also underfloor heating (UFH). However, when the UFH system is set to "auto", the heatpump operates for up to an hour per day for no apparent reason - i.e. no room...