Thermostat switched off but radioator is warm and keeps heating


I have 4 smart thermostats installed. Last week, even though all smart thermostats were OFF, the radioator in the living room was warm and we could notice the room temperature as higher than expected.

I did the reset procedure, expecting it to be a calibration issue. It did not help. I then switched that thermostat with another spare one (brand new) which went through the initial calibration and all seemed fine, until the next day. After turning it ON manually, and then OFF, the radiator kept heating until today.

I don't know if it's related but all of the graphs for all the thermostats show a flat line today.

Any advise is appreciated.


  • Ray

    I have the same issue. Any solutions, very welcome

  • JanisU

    I have same issue. Have Tado thermostat in my bedroom and heating is always on despite the fact the temperature is well above the expected.

  • Julia


    This issue can have various causes. Our support will gladly investigate and help you resolve the problem, but since causes differ from case to case, we won't be able to help with that on this forum.

    Please open a request in our Help Center and let us know the serial number of the device(s) affected as well as specific times and dates at which you observed this.

    Best regards,


  • lmineiro
    edited February 2019

    Thanks. Yesterday I have changed the thermostat to another radiator. While doing so I managed to damage the thermostat head nut ( but it seems to be working fine so far.

    I'll open a request with the timelines as suggested to get a better understanding of the events.


  • lmineiro

    For me, the problem ended up being that the thermostats were getting a bit loose. It seemed to be enough for the valve to stay slightly open, even though the thermostat itself couldn't detect that.

    The root cause was that my radiators thread size was M30x1.0 (Oventrop) and the thermostat was M30x1.5. It wasn't different enough to make it clear that it was wrong but different enough not to screw completely and properly, leading to the situation.

    After tado showed me which adapters I had to get (form Oventrop directly) and putting them on all my radiators, every Thermostat has been working perfectly since. They did respond to my help request with very detailed steps - thanks.

  • Tim

    Seems like LOTS of people having this issue. I should have searched before I started my thread (

    I have to agree with @thekingster - Tado support seem very slow and not particularly helpful.

  • robertdyan

    ALOT of people having this issue, and despite what TADO says, there is NO simple solution. It's costing me money, time and stress.

    I love most of the system and the app, but this is frustrating, especially when i have more than 1 TRV in a room. I have no idea what the temp is, and when noone is in the house, they're still heating the rads.

    TADO, your support is awful.

  • Atonnnis
    edited November 2019

    I've had it. They have the nerve to send me a bill for using their devices when I should be taking them to court for thousands and thousands this sh*t system has cost me in wasted heating and suffering in a house-turned-oven. Even now it is telling me the temperature in the house is 21-22C whilst my thermostats are set to 11C, but for some reason my radiators are all pumping out heat like the sun isn't due back for a month.

    I don't care whatever it'll cost me to get rid of it all and put in something else. It's now reached the point where it'll still definitely be cheaper than keeping this system in my home.

    You have my account details, so a personal phone call that fixes everything in a way so that it doesn't revert back to this nightmare before tomorrow morning when I sign off on the new system is the only way this s*** mess of terribleness is remaining in my home. It's a shame, I had such reasonable expectations, and high hopes of being able to show everyone my impressive system, but now.....I'm pretty sure that the lifespan of this company's stuff in this country (UK) is now to be measured in hours. It sucks.

    Edited by admin, reason: Please avoid using expletives.

  • Steven

    Only problems I've had have been stuck TRVs. System has worked flawlessly for me for over a year, got 9 radiator valves in total.

  • Hotrod
    My Airbnb guests tend to turn the tado rad thermostats off its seating resulting in a very hot radiator which is set to a low temp. One guests had the room with window open at 27deg and complained they couldn't turn rad temp down. I has to get a good neigbours to go in and re-attach taco valve. Problem is it happens to often because it's not clear to guests what part of the valve should be turned to adjust temp.
    My solution thus far is to add wide elastic rubber bands to the upper adjust section in the hope they gravitate towards this when adjusting temp and not the lower housing. That said I noticed the room temp rise to 26deg yesterday, window open and setting at 9deg, so i dont think it's worked out as hoped. I turned off the wall thermostat which appeared to turn off all which is fine given avrg. Inside temp is 20deg. So heating not required.
    Tado TVR's should be designed to lock into housing and not screw down only. Design problem which is causing me regular headaches
  • sorenahrbo


    I do also have AirBnb guests.

    Even marking the top with black and the message "Turn top only", they do it and the out of control.

    Here is a link to some pictures, quite easy to do, then it will never happen again :-)


  • makum101

    I've just had this problem and fixed it. . One of my Stats was not fully closing when set to off and allowed heat through if another stat in the house called for heat. heres how I finally fixed it...

    Removed stat from base

    Removed batteries

    Removed Base from Radiator

    Put batteries in stat

    Attached stat to base IN MY HANDS not on the radiator. (difficult to tighten the notch but possible with practice.

    it attempted to calibrate for a little longer than it did on the rad and eventually gave up and displayed the error code 'E4'

    Took stat off base and removed batteries

    Put base back on radiator (rad was warm, not sure if this makes a difference)

    Put batteries back in and attached stat to base (heat was previously set to off)

    It finally calibrated correctly.

    I think making it go into error state sort of reset its memory because it took longer to calibrate once back on the rad after I did that.

  • Imcnaull
    The help is slow and hopeless.

    Try switching HW off? It stays on. Try switching CH on? Stays off.

    It randomly comes on or doesn’t turn on at various points during the day and also loses connectivity randomly despite being well positioned and working for a few days on the trot.

    Hopeless system, paying to have it removed. Honestly costs so much time to manage and money to pay out in incorrect heating schedules. Do not buy.
  • Robby
    I have exactly the same issue for such a long time. It’s certainly driving me nuts. Tado forum team should share step by step procedure for fixing this issue.
  • [Deleted User]

    Hi there,

    Just posting our standard trouble-shoot procedure for this issue:

    Please remove the Smart Radiator Thermostat from your radiator and take out the batteries for a few minutes. Please re-insert the batteries into the Smart Radiator Thermostat and wait 1 minute before re-mounting it to your radiator. If this does not resolve the issue, replace the batteries with new fresh ones, just to confirm the issue is not caused by the original batteries.

    If this still does not solve the problem, please follow the steps below:

    • Change the Smart Radiator Thermostat which has a problem (A) with a different Smart Radiator Thermostat (B) which works fine. Make sure to also change the white tado° mounting bracket from one radiator to the other and, before mounting the Smart Radiator Thermostats to the new radiators, take out the batteries for a few minutes.
    • Observe over the next 24 hours if Smart Radiator Thermostat (A) can close the radiator.
    • Also check if Smart Radiator Thermostat (B) can close the other radiator.

    If an issue persists, please describe in detail what happens when you performed the last test to:

    or provide this info via our Live Chat

    Kind regards,


  • Just installed it today and got the same Identical issue. Waiting on tech support to assist further.

  • manesh_tailor

    I had the same issue - but got it fixed!

    I can't say if the issue you are having is the same as what happened to me, but mine wasn't a problem with Tado, rather it was a problem with another component in my Central Heating system. My recommendation is to get a good plumbing firm that knows about Tado and complex setups to come and have a look for you. I would highly recommend Gasworks Plumbing and Heating 0800 999 8143

    The situation I had was that I would have all the TRVs and Thermostats (which control rads and underfloor heating) set to OFF in the app and also had the Hot Water set to off. BUT the central heating would keep running day and night. The only way I could turn off the Central Heating was to turn off the whole central heating system in my gravity-fed (traditional) system. Gasworks figured out that it was one of the relay switches that was faulty. They changed it and all is right again

  • Kris81
    Installed tado value but they devise does not turn off the radiators, I now have to pack up everything and return it. Back to square 1