DIY_Amateur 0 Posted April 7 Hi - I'm pretty sure the thermostatic head (with capillary sensor) on my UFH manifold is knackered. I can get a replacement and the head will just screw onto the valve body but accessing the current sensor and having room to remove it is going to be a pain. Two questions: 1) The sensor is held in with a grub screw so I assume it's not actually immersed in water inside the manifold (Uponor Vario B, maybe cocooned in a sleeve?) Is that right/likely and if I was able to remove the grub screw and get the sensor out would I need to drain the manifold first? 2) If I really can't get the old sensor out can I attach the sensor directly to the flow side of the manifold with some cable ties and maybe some aluminium tape/insulation - would this work do you think? There are surprisingly few pictures/video of this job so I appreciate any knowledge of what it involves. Thank you Share this post Link to post Share on other sites
PeterW 4,292 Posted April 7 Sensor will slide out of its pocket. Just remove the link grub screw and twist it a little to break any potential corrosion. They are dry pockets so no water should escape. Share this post Link to post Share on other sites
DIY_Amateur 0 Posted April 7 Hi Peter- that's very helpful thank you The sensor is pressed against the wall so would need to slide 10cm or so into the wall! I'm tempted to see if I can find a way to carve a hole for it to slide into but if not it plan (2) - any thoughts on whether strapping it to the manifold would work adequately? Share this post Link to post Share on other sites
PeterW 4,292 Posted April 7 You’d need to work out how to get the new one in too ..! I do sometimes wonder what installers are thinking when they install these ..!! Share this post Link to post Share on other sites
Nickfromwales 3,176 Posted April 7 Drain down and disassemble. Do the job properly Share this post Link to post Share on other sites
DIY_Amateur 0 Posted April 8 Thanks Nick - I went for plan (3) and created a hole in the wall that I could slide the sensor into and remove it, so I've saved having to drain down and hopefully the new part will fix things. Thanks for the advice Share this post Link to post Share on other sites
ProDave 4,476 Posted April 8 16 hours ago, PeterW said: You’d need to work out how to get the new one in too ..! I do sometimes wonder what installers are thinking when they install these ..!! Had the same problem with a HW tank and immersion heater, I had to cut a hole in a wall to get the old immersion heater out and a new one in. People just don't think. Share this post Link to post Share on other sites