Tado turns on heating with all valves closed?
Irek85
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Hello,
Do you know is it safe if all valves are closed and boiler starts to heat? I believe this shouldn't happen but I may be wrong.
Do you know is it safe if all valves are closed and boiler starts to heat? I believe this shouldn't happen but I may be wrong.
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Answers
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Thanks for your response. There is a safety mechanism built in the boiler (diaphragmatic vessel if I translate it correctly) but my question is more regarding functioning of Tado thermostat. After some corrections made by support one of thermostats started calling for heat despite all valves being closed - including the one controlled by this (wired) thermostat. I don't know how to deal with it.
Maybe my logic is flawed, but what is the point of forcing the boiler to heat and closing all the valves at the same time?0 -
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@Irek85 Hello. Most boilers require a bypass (and pump overrun) to allow heat in the boiler to dissipate. This may be an internal bypass valve, external bypass valve on the pipework, or an open radiator without a thermostatic valve. Without an external bypass, valve or open rad … some boilers will go into an overheat error when all TRVs close off. The boiler documentation, and looking at the installation, is the only way to provide the answer. If in any doubt, best to check with a qualified professional who knows your system.
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@Treskelion1959
Well, thanks for the guide but I'm V3+ user :) I installed everything almost 2 months ago and this problem didn't occur at first. It stared after support made some changes lately (they didn't want to disclose what specifically despite me asking twice). It's caused by one specific wired thermostat controlling UFH valve.0 -
@wateroakley
Thanks for your input. So to sum it up, if you could explain it to me in plain English - what's the point of thermostat calling for heat if the valve it controls remains closed? Out of the box wired thermostat always turned on / opened (relay connection) the valve when calling for heat and it was logical for me. Now I don't get this behaviour. It's like accelerating with handbrake applied.0 -
@Irek85. The bypass explanation is what happens when adding TRVs on a heating system with radiators. Sorry, my experience of the situation with ufh valves and the relevant settings on a wired stat is limited.
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Conventional wisdom is to always leave at least one radiator without a TRV/SRT, so that it is never fully closed and always allows water to pass whenever the boiler is running.
In my home the main Tado thermostat (smart wired thermostat) is in the hall and the hall radiator has no TRV/SRT. Therefore there can never be the situation when the hall thermostat calls for heat and the radiator is closed.
As for all the other radiators, each is fitted with a Tado SRT. As I described in another post, I actually have a few radiators with the SRTs fitted loosely, so those radiators also cannot be closed. This is my solution to the exact problem you describe.
With all that said, the situation you describe shouldn't happen. Tado needs to fix it. But you should still have at least one bypass radiator, regardless. Pick the one that best suits needs. Maybe the bathroom, maybe the hall, maybe the lounge, maybe the coldest room - whichever room will most usefully benefit from heating whenever the radiator is on .2 -
@eezytiger
Thanks for your comprehensive advice. I appreciate it. There are some safety mechanisms built in the boiler. I also have RTL based UFH circuit in bathroom that's always partially open. It's three-storey building, so even with all valves closed there are some pipes to adopt some heat. In the end there are no errors on my boiler due to this situation, but it causes a lot of cycling and a lot of temperature spikes (potentially more calcification).
To manage this situation on my side I would have to open few radiators on 1st and 2nd floor, but 1st floor is turned off during night (it drops just around 0,5-1C anyway) and we don't use 2nd floor yet (couldn't afford finishing it).
I'm positively surprised by Tado community, but can't get much help from official support. In installed the system in second half of October and just few things needed adjusting. I've been writing with them back and forth for many weeks.
My road so far:
- I install Tado wired thermostat to control UFH valve/pump
- it can't call for heat because I can't select thermostat controlling the boiler as a zone controller
- the chatbot enables ability to change zone controller in Tado app after dozens of messages
- I select right zone controller and ufh thermostat opens and closes the UFH valve (starts/stops UFH pump) correctly when starting to call for heat also correctly
- I notice early start doesn't work as expected
- it gets corrected by Tado support in some manner but with information it won't work exactly as expected because of some software limitations
- ok, I'll work around it. I mention ufh is overheating
- it gets corrected by Tado support (I'm not informed how despite asking)
- it's still overheating and additionally under heating now
- it's again corrected by Tado support (no information how)
- we are today with a problem caused by last change: thermostat shows call for heat constantly (24/7) - it didn't happen before; additionally thermostat opens/closes the valve unrelated to calls for heat visible in the app; in result boiler is asked to heat when the valve is closed.
The worst part is that Tado representatives try to close all requests/tickets in one message which results in not understanding user situation and often twisting what is asked for to fit some template they have prepared.0 -
Unfortunately, underfloor heating and all the additional valves and pumps is alien to me. I just have a combi boiler and nine radiators with eight SRTs. There is no complexity to the operation now that I understand the Tado system within my environment.0
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@wateroakley thanks, I really appreciate your engagement0
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@Emcee
thank you very much0
