Bobbins

Thank you @JohnMo, @Temp, @dpmiller for the responses. A temporary cap makes perfect sense... but unfortunately it will not budge. I'm thinking my best option may be to buy a new unit and start again. Really grateful for everyone's help, I feel I know so much more than I did a couple of days ago!

Thanks for the quick reply ProDave, really appreciate your help! I’ll have a look into the 2 port motorised valve for sure, as have power close by

QQ, is there something a bit more 'standard' that could be used to replace the Danfoss FHR? Rather than buying a direct replacement?

It is a shame but as you say will be the easiest solution. Would be great to get it working, as think it will be pretty chilly in the winter without it! Thanks for your help!

This is the blurb:

Have been able to identify this part online, which feels like progress!

Yes it's the same thermostat in the original post. There's no obvious way to clip it on to anything, the grey bit on the left hand pipe is too slim and smooth for it to be able to attach there. It's a bit of a mystery!

Thanks so much Temp and ProDave for your comments. The red knob says Hep20, am attaching a photo showing the detail. And unfortunately the thermostat isn't even attached to anything! Not sure if it's broken or if a part is missing?

I'm hoping someone can give me some advice about the UFH in our new home please. The only sign that it even exists is as per the photos. There's no separate thermostat and no obvious link to the boiler. I'm guessing it runs off a nearby radiator, but would have thought there might be a separate control or something somewhere, but there isn't. Not too sure how I would go about trying to fix this, or even if it would be possible for me to do anything other than getting a professional in! Thanks