underfloor heating

  1. B

    Replacing underfloor heating stat with no floor sensor.

    Hi, I've not really got involved in underfloor heating before, but a customer asked me to replace her OJ Microline manual stat for her bedroom heating which had packed up with a replacement generic version she got from Amazon. I assumed it'd be a straight swap so said yes and wired it up, the...
  2. telectrix

    underfloor heating mat - how to cut a turn

    never installed one of these before, always used the element on a roll type. question is how to cut to turn a corner 90 degrees without leaving a gap in the mat.
  3. C

    Programmable thermostat Danfoss wiring

    Hi guys. I have a question about wiring scheme and how to wire my heating floor thermostat. I have this scheme and correct me if I am wrong but I have to connect floor mat wires with L load and N load holders and true live and neutral with L and N, right? And how do I connect two sensors, it...
  4. E

    Underfloor heating clicking on and off (electric)

    Little video here: View: https://youtu.be/rLvJxZlgWDo The relay just clicks on and off. I've attached a few photos of the internals of the unit. It's quite old, but was working a while ago, so perhaps a replacement might sort the problem, what do we reckon? I guess it just uses an ambient...
  5. J

    Flooring Tripping RCD

    I have fitted underfloor heating, using a WarmUp Wifi thermostat. When i turn it on, the RCD trips after 5 seconds on initial turn on. I have measured the following; Live - Neutral - 39 Ohm (expected for size of mats) Neutral - GND - >1M Live - GND - ~150k Now the L-G resistance of 150k seems...
  6. H

    Heat mat programmable thermostat

    Hi everyone wondering if any one can help point me indirection I have a heat mat installed with a ntc5k sensor and client is looking for a new programmable thermostat most ones I found are ntc10k (warm up mat)I found a website where the manufacturer can adjust to suit floor sensor but can't...
  7. M

    Underfloor heating separate thermostat

    we have a conventional heating system and underfloor heating recently installed by the builders plumber - it’s all wired up (pump, valve, thermostat receiver etc..) but both the electrician and builder seem to be at odds with the connection at the boiler. currently the boiler just has LNE and...
  8. T

    (Wrong category I know) Need advice on plumbing my own house?

    Firstly I know I’ve posted this in the wrong category, I couldn’t find the right one for some reason. I’m a industrial/domestic electrician, I’m doing a rear extension and loft conversion on my bungalow myself. I’m of course doing the electrics myself and I’m looking at plumbing the CH and...
  9. B

    Replacing NeoStat with Nest

    Hi, I'm just looking for some advice and info about how to replace our thermostats with Nest ones. My current setup is (images attached): 5 NeoStat v2 for 5 separate rooms in a small flat Underfloor heating from a district system Heatmiser UH8-N I'm not looking to do this work myself but...
  10. C

    Why are the contactors always closed/energized?

    I just installed a brand new 36 kw electric boiler. 240v, 3 ph, works good, more expensive to operate than I had hoped...regardless when the power/circuit breakers are on, the contactors energize/close always. Why? That makes no sense to me. What’s their purpose if always energized. Why not...
  11. L

    Underfloor heating with economy 7 ?

    Hi everone can anyone advise me on two things I'm having underfloor heating fitted and want to run it on my economy 7 Has anyone managed to do this and how could you control the input? What sort of electric metre could be used? Bearing I. Mind it turns off during the day so won't have...
  12. S

    Under floor heating over 3kw

    Hi guys Being to a job today where the builder has installed some electric under floor heating Total area is 20.5 m2 The mats are 150w per m2 The total load is just over 3kw. He has first fixed the wiring and checking it he has used a socket wired off the ring main to spur off to a switch...
  13. R

    Insulation resistance check

    Hi - I have a Warm-up underfloor heating system. And it's stopped working. I did a basic resistance check - and clearly there's a problem (shows just 18ohms when it should be nearer 200). Warmup have said they can send an engineer around to lift a tile after doing a thermo heat check...
  14. S

    Is certificate part of installation?

    I don’t want to see my sister ripped off, so I thought I’d ask a quick question of you guys if I may? My sister had underfloor heating installed in bathroom with new circuit. The electrician said he would get her a minor regs certificate which She needs to uphold the underfloor heating...
  15. B

    Heatmiser UH3 troubleshooting

    Hi fellow electricians, Wondering if anyone out there can kindly help me out? I have a underfloor heating controlled by UH3 heatmiser. When thermostat control is activated, there is no boiler response and hence no heating. Has anyone come across a similar problem? Is it a relay fault within...
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