Why is Heating Coming On when Temp Reached
Why is the heating coming on when the Thermostat is set to 18.5 on the schedule and the current temperature on my phone app is showing 19.2.
So the app is reading current temp 19.2 and Heating to 18.5.
I have read the other thread about the Heating randomly coming on and I checked that Early Start is off on all Thermostats.
Thanks
Just happened again so checked at main thermostat which showed a temperature of 18.9 and heating to 18. Doesn't make sense?
Will try new batteries.
Answers
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@Heatsaver this is what I got back from support when I asked a similar question:
Thank you for contacting us.
The tado° Smart Thermostat is a PID controlled thermostat. This means that tado° not only looks at the current temperature but also at the overall temperature trend.
In other words, it will turn the heating on until the room temperature increases just above the set-point. Then the heating will remain off until the temperature starts to drop.
In doing this, tado° can prevent your heating from switching on and off too frequently and thereby protect the boiler from excessive wear and tear. It is also much more efficient in terms of energy usage.
It can also happen that, when tado° notices the temperature is dropping very quickly, it will start to heat in order to prevent the temperature from dropping too far below the set-point, even though the current temperature is above the set-point.2 -
@johnbur Many thanks for your reply. I had an inkling it was attempted AI but not sure it stops the boiler from turning on and off a lot.-1
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@Heatsaver agreed, I understand their logic, but I guess when you can have multiple rooms calling for heat at different times, there is bound to be a compromise somewhere.0
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Happening again this morning. So no radiator thermostats calling for heat and main thermostat set to 19 and reached 19.3 after approx 60 minutes of heating(cold morning). Thermostat turned off boiler.
10 minutes later thermostat still at 19.3 and it turns heating back on so shows Heating to 19 Temperature 19.3.
So I reduced temp to 18. Still calling for heat. So I set system to Away and boiler goes off.
5 minutes later boiler back on.
So I set system to frost free to turn off boiler.
When first installed the system only called for heat when the temp dropped below the set temperature. So presumably it has been applying data to its pid algorithm over the first few weeks of use.
At the moment it seems to be costing me more money and burning more gas. Also switching boiler on and off far to much.
If I understand the Pid system correctly it allows for degrees of power or energy to be called from a boiler or heat system but my boiler is either on or off. Perhaps it's not suitable for this set up?
Now I am thinking of removing it all and selling and going back to a dumb thermostat. Sad 😔3 -
@Heatsaver
I agree that the pid logic often/sometimes appears irrational.
Only other factor I have found is that making adjustments and waiting for a response can often be negatively impacted by delayed comms between the trv and the bridge and/or the bridge and the extension kit.
Ie you make a change in the app, the system appears to accept the change, but the devices carry on acting incorrectly for sometimes 15+ minutes. Sometimes missing whole heating periods but the graphs don't show and communication drop outs.0 -
Yeah, I am currently having a similar problem but my heating is set to "OFF" via the TADO app and the following is how TADO runs my boiler 24 hours a day, when it is switched off........... For example, I am asleep, or out of my home the boiler just runs and switches off continually at these times when I do not want my heating on.
I switched off my heating on Saturday 8th January via the TADO app and this is how by boiler ran.........
Off. Via the app. 13:45
Boiler On 13:48 until 13:52. Four minutes. Then switched Off.
Boiler On 13:57 until 14:06. Nine minutes. Then switched Off.
Boiler On 14:12 until 14:16. Four minutes. Then switched Off.
Boiler On 14:22 until 14:26. Four minutes. Then switched Off.
Boiler On 14:30 until 14:37. Seven minutes. Then switched Off.
Boiler On 14:43 until 14:47. Four minutes. Then switched Off.
Boiler On 14:53 until 15:02. Nine minutes. Then switched Off.
Boiler On 15:08 until 15:12. Four minutes. Then switched Off.
This behaviour is what happens when my heating is switched off via the TADO app and this behaviour has been present since I first installed the TADO V3+
I have been in touch with staff at TADO via email but they do not seem to understand.
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Happened again this morning. Scheduled temp 19, Thermostat reached 19.3 and boiler turned off.
5 mins later it turned back on and heated to 19.8 and then turned off.
5 mins later it turned boiler on again at which point I changed schedule temp to 18.
I will change the scheduled temp to 18 tonight and see what it does. Maybe I will get the 19 that I want.0 -
I’m having this exact same issue. Had my setup for over 4 years without any problems but in the last 3 months I’m experiencing exactly the same as you guys. I have my temp set to 21.5, sometimes I set the temp to 25C for 15minutes as a boost. The boiler comes on for 15mins then turns off as expected. The boiler resumes to its 21.5 setting and the temp will show something like 22.3C because the heating has been on for 15mins. Then 5mins after going off the heating turns on again for another 5mins.
Sometimes the thermostat will be set to 21.5 and the current temp will be 21.8 but the heating is still on. In the app it shows heating to 21.5 with current 21.8. If I then set the temp to be 17C the heating turns off immediately. After a month or so I resume my 21.5c schedule and despite the temp showing something like 22C by this point the heating still kicks back in for about 5mins.0 -
Rather than looking at the current temp, look at the temp trend. Tado will turn the heating back on if it sees the temp dropping even if the temp is still above the set point. This is it trying to stop it dropping too far below the set point.
You should also notice that tado will turn off the heating when the temp is below set temp but still rising as it learns that the residual heat in the radiator can be enough to keep heating the room to the set temp0 -
It’s definitely not temp trend as it comes back on about 5mins after going off when the temp is over 1°C above the desired temperature and all the radiators are scorching hot. I’d understand if it was coming back on at different intervals after going off but it seems most of us are experiencing it coming back on roughly 5mins after going off.
It’s strange as I’ve had this setup for 4+ years now without any of these issues. It’s also weird that others experienced this 2-3 years ago so can’t be related to a software update if I’m only experiencing this recently(2-3months).0 -
Recommend you get Tado support to check on the delay times between call for heat actually ending and when it is instructed at the boiler. They have that data. Get them to check and respond clearly within 2 working weeks.0
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Thanks policywork, that’s really helpful! That’s exactly the type of thing I needed to know. Appreciate it.0
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I've just posted a similar problem.
The measuring device in my lounge (a Wireless Thermostat) is set for 16 degrees but the Wired Thermostat (Zone Controller) is heard to turn on and off as often as every 5 minutes. The temperature does not changed that fast, up or down, it has remained at 16.6 degrees. There is no TRV as the rad valve needs replacing due to it being stuck open so I removed it from the rad and the app.
All that has happened/is happening is my boiler is haphazardly firing. The Zone Controller seems to wait until the boiler fires and turns off!!!!
Why can't we get a reason for this? I have noticed many people with the same issue, but there's never a clear answer as to what the issue is.
I've never used as much oil as I have since fitting tado, and my house isn't as warm.
I've asked before; can we please have a setting that turns off this "Artificial (Un)Intelligence" (Weather Adaptation?) Or can a setting be placed on the app where we can manually add a from/to heat range (is this hysteresis?) so for example +/- 0.5 degree, so if the thermostat is set to 18, it will heat to 18.5 and turn off until it drops to 17.5?
Is it too difficult? Its what manual thermostats do after all?
I'm finding more reasons than ever to remove tado completely and go back to manual TRVs and wheel thermostats, and far fewer reasons to keep it.
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Leaving an update here as Tado support fixed my issue by pushing my config to my thermostat. Guessing that’s like refreshing the config.
My issue was I leave my thermostat constantly at 21.5C. Every now and then if I want a short boost I set the temp to 25C for 15mins and the heating kicks in and heats for 15mins then turns off. This is how it has worked for 4+ years but recently around 20mins after the 15mins timer had expired and the thermostat reverts back to 21.5C the thermostat was turning the heating back on for a short 5min period which it should do as the current temp at this point t would be around 22.6C and the thermostat temp was still set to 21.5C. So annoying and not energy/cost saving. After a back and forth with support for a few days they finally pushed my config and it now doesn’t turn back on again short after the timer expires. This might also fix the problem for you guys so just ask them to push your config.0 -
I was looking into something similar recently too, as our boiler comes on more frequently since we've installed Tado X and when it does, it's on for only few minutes.
For example, the room thermostat will read 20.1degC (setpoint is 20.0degC), the system will come on for 5minutes and then off - repeat after 10-15minutes (it varies). The room temperature didn't even had a chance to drop slightly.
Normally, I would expect that the temperature would need to drift a bit more before heating is enabled (lets say down to 19.7degC before heating comes on and switches off at 20.3degC). Otherwise the system comes on/off too often, compared to what Tado advertises. I don' really need a precise +/-0.1degC temperature control…
I have raised this with the Support to check if there is an option to adjust the hysteresis on the system and the response was:
In contrast to our V3+ and previous generations of products, we willnottroubleshoot using PID changes or heat-up gradient adjustments with the new line of X devices, as per our launch.If you have a specific error, we will need detailed explanation to escalate the case.So yes…a bit on the fence here in terms of the new Tado X product….
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