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Tado turning heating on in the night - any ideas?

I have 7 rooms/radiators controlled by Tado with a wireless thermostat in my living room room and Tado TRVs providing the temperature input for another 6 rooms. Everything is on the same boiler and radiator loop. I'm in the UK if that makes a difference so it's a very conventional UK pumped hot water radiator system all on a single loop with no fancy zone valves or anything just TRVs controlling individual radiators.

Last night I got caught up in a book so was on the sofa in my living room until 2:00am finishing it. 2 of my rooms are spare bedrooms so are always set to 5C since I don't use them. The other 5 rooms are all set at varying temperatures during the day but all have smart schedules that put them down to 5C at midnight except for my master bedroom that is set to go down to 10C overnight. When I finished my book it occurred to me that it was still very warm so I went and checked my sitting room radiator and it was on full blast at 2:00am and blazing hot.

Now I know that it is strongly recommended by Tado to have a TRV on the radiator in the room with the wireless thermostat in it but I have fancy designer radiators and to fit a TRV I need to replace the radiator completely with the version designed to take a TRV. I might well do at some point because I understand why it is best but for now at least this non-TRV radiator is in the biggest room in my home that is set to the highest temperature of any room anyway (by about 1C) so as TRVs fire up the boiler to keep my other smaller rooms at their set temperatures during the day and evening it is unlikely that the extra kicks of heat into my bigger sitting room will take it too far over temperature, or even over temperature at all, and in my few weeks of Tado ownership this does seem to be the case so for now I'm living with what I have.

At first I thought I might have accidentally set a room temperature higher and left the room set on temperature changes staying in effect until manually cancelled rather than until the next schedule temperature change (I've made that mistake about 3 times so far as I've added rooms/TRVs!) but no, every room was at its expected 5C/10C overnight smart schedule temperature and all rooms were showing current temperatures on the Tado dashboard significantly above their set temperatures. Even the unused and never heated bedrooms were at about 12C and the living room was at 22.5C vs their set temperature of 5C so, as expected, the Tado dashboard showed no heating on any room despite the fact that the boiler was on and pumping out heat at full blast into the un-TRV-d sitting room radiator. The Tado wireless receiver did "know" that the boiler was on because when I went and checked it I could see that the blue heating LED was on so the reason that the boiler was on was because Tado was closing the heating relay in the receiver rather than a short circuit or some other glitch in the boiler itself.

I then looked at the lights on the internet gateway and all 3 were solid white and the Tado app confirmed that there were no "connection lost" or "no remote access" communication issues in my setup so I am now at a complete loss to explain what was going on. This seems an incredibly basic fault so I'm wondering if there might be some faulty hardware in my setup or does Tado sometimes have such "brainstorms"?

As a next obvious step I would have power-cycled my internet gateway and maybe also my wireless receiver in case it was a firmware bug that a reboot might have cleared but it was about 2:15am by then and I didn't want to mess about with it in the dead of night, and it's cold in the UK so I also didn't want to risk ending up in a no-heating situation the following day (today) so I just left it alone.

As I type this it is now 11:00am and the boiler is off so Tado has finally stopped holding down the relay switch when no heating is required and my dashboard is showing every room pretty much dead on their smart schedule target temperatures so sanity seems to have returned. I still need to contact Tado support on another couple of issues so I'll watch what happens overnight tonight and Sunday night before contacting support on Monday to discuss this and the two other issues that I am having but in the meantime I'd be interested in any insights that more experienced users might be able to offer regarding why my Tado setup went crazy last night and whether the behaviour I described above has been encountered before. Anything I can learn hear first might be very helpful for my discussions with Tado support on Monday.

Answers

  • I have the opposite issue where tado not switching on the heat, even when trvs calling for it. I'm wondering if you've missed the OFF switch whilst I've missed the ON switch. I wonder if there are issues at Tado on the cloud side?
  • I had this issue until a few days ago (boiler switching on in the night when no demand). I'm sure I have worked out what caused it to switch on but I'm not clear on why. My system (room thermostat and smart TRVs) are set to switch off at 10pm and back on at 6:30am. On two occasions when the system switched on in the night I noticed that the app was showing 'no remote access' for the receiver. Even though it lasted just a few minutes, when the connection was restored the boiler seemed to be driven from the room thermostat, aiming for the last temperature that was set in the thermostat. This setpoint remained all through the night.

    The fix that I put in place, that seems to have worked, was rather than 'switching off' the room thermostat at 10am, I have now set the schedule to reduce the temperature set point to 10 degrees (which of course it won't hit). Since then, the boiler hasn't switched on during the night.

  • sorry, *10pm (last para)

  • Thanks for the replies. My issue seems to be different to yours @Leyther and sadly for me it persists, it happened again last night. My heating seemed to switch everything off OK at midnight and to be sure I went and checked the wireless receiver just after midnight. The blue LED heating light was off and, as expected, all the lights on the boiler showed it as not active. At that point I also checked the Tado app and all rooms had gone to their overnight temperatures, 5C for everywhere except the 10C in the master bedroom. I then went and did an hour or so of reading in my living room. Just after 1:00am I checked (although I already knew because of how hot it was) and the boiler was back on and the living room radiator (one of the few without a TRV) was at full blast.

    The living room is where my wireless thermostat lives and, before the smart schedule for that room turned it down to the overnight 5C temperature at midnight, the last active heating temperature in the smart schedule for the living room had been 21.5C. The actual temperature Tado though that the living room was at at about 1:15am was 23.5C and I'm sure that it was right because it was uncomfortably hot. I think that for my case at least that demonstrates that it's not reverting to the last set temperature on the wireless thermostat (or anywhere else in the system) because there aren't any time blocks in any of my smart schedules that go above 21.5C so letting the temperature get up to 23.5C with the heating still going full blast to try and make it even hotter is totally off the scale.

    I guess I need to raise this with Tado support because there have been at least a couple of other nights since my initial post when it's happened.

    A few nights earlier when it happened I went and power-cycled the wireless receiver unit (by switching on and off the mains isolation switch next to it which also feeds the boiler) and after the wireless receiver rebooted the blue heating LED stayed off and the boiler stayed inactive as I wanted. This was again at about 1:30am and I then went to bed so I can't be sure that Tado didn't fire up my boiler again a few minutes later but the reboot did at least seem to clear the heating-permanently-on state for that night which makes me wonder if I might have a hardware fault in the wireless receiver unit causing it to crash now and then.

    By the way, when you say "rather than 'switching off' the room thermostat at 10am, I have now set the schedule to reduce the temperature set point to 10 degrees" what do you mean by 'switching off' a room? The only way I found to control rooms is via the smart schedule time blocks so when I 'switch off' a room I put a time block into the smart schedule for that room with the temperature set to 5C. Is that what you mean by 'switching off' or is there somewhere else in settings where you can explicitly say don't heat a room at all at certain times?

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