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underfloor heating

  1. Y

    Changing original 32Amp contactors for solid state relays?

    Hi Guys, My underfloor heating has 3 x 32amp contactors. They make a hell of a thump when opening and closing. Bit of a hum also. I'm looking at the idea of changing them for solid state relays like this one Solid State Relay - 40A (3-32V DC Input) - COM-13015 - SparkFun Electronics -...
  2. R

    Help required please re PRT-E thermostat wiring symbol (difference between models and compatibility)

    Hi all, firstly I’m not in anyway qualified to do any electrical work but was just hoping for a quick piece of help In regard to trying to find a replacement for my non-functioning Uponor PRT-E digital thermostat which controls our underfloor heating. The model in question, the PRT-E is generic...
  3. Y

    Chinese copy of Honeywell t6360c warming up

    Hi guys. Moved in to a new house last year. We have underfloor heating in all of the rooms. 10 zones. I see they have chinese copies of Honeywell t6360c thermostats. 10 years old. First test I noticed the thermostats turn off after about 5-10 minutes. The thermostat housing where the side...
  4. E

    UFH / S plan diagram

    Could somebody run their eyes over this diagram and let me know if I’m about right. I’m new to UFH and UH8 in particular. It’s a viessmann vitodens 100-W. Two S plan systems and UFH.
  5. Confused...

    Aube TH232 showing HI

    Hello My Aube TH232 is showing the error message HI which means the actual floor temprature is above 70C But its not....the floor is at ambient temperature of 24C Its not the thermometer as I have swapped it for a new one with the same error message So I presume the sensor has failed? Would...
  6. M

    UFH 4 Wire Actuator Wiring

    Hi, just recently wired in my single zone (4 loops) wet UFH system. I found it relatively simple as I think it is a basic layout. Heating is S plan (UFH/Rads) however it is only wired together using (the supplied) box with a big choc block connector rather than these fancy wiring centres you...
  7. D

    Warm-up MStat change out help

    Hello I recently had a Warm-up underfloor heating system installed, but due to a breakdown in communication. I ended up with the basic Mstat controls units rather than something digital/programmable. The MStat comes with NTC5K sensor and for some daft reason the rest of their thermostats use...
  8. 9

    Can elec UFH thermo control floor and elec radiator ??

    Hi all, new member here with a technical question. I am doing a refurb and want to know if I can connect a 300w electric radiator to the electric UFH thermostat. Basically want the radiator to come on at the same time as UFH. Thermostat will be running in floor sensing mode and controlling...
  9. 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...
  10. 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.
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
  21. 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...
  22. 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...
  23. 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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