Tado X violating OpenTherm standard
Cross-posting from the Dutch community since this affects all Tado X users.
I want to warn customers with a Tado X. Tado is intentionally violating the OpenTherm standard, specifically manipulating values ID 016 (room temperature in degrees) and ID 024 (room temperature setpoint in degrees).
Instead of sending the real values to your heating system, they send a constant room temperature of 20 degrees and an arbitrary setpoint that is apparently designed to make your heating system to react faster. The only thing it does is make my system (Quatt hybrid heat pump) go crazy. It needs the actual values to control the system, not the Tado manipulated ones.
The OpenTherm Association mentions that Tado is certified and provides these two IDs: https://www.opentherm.eu/request-details/?post_ids=4925
I can confirm that they are not compliant with the standard any more.
Eveey firmware after 247.1 is affected, before that they adhered to the standard. Strangely, the V3+ does not have this behavior, and every other thermostat on the market seems to be able to implement the standard correctly.
The head of Customer Experience Jurian has confirmed to me that this is intentional and that they do not intend to change this.
I have offered to provide input to engineers at Tado on several occasions but I have received no response so far.
For me and other Tado customers with a Quatt heat pump, the way Tado seems to handle this issue and their customers is really disappointing. I hope someone from Tado can chime in here on this situation.
Comments
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Tado helpdesk can downgrade firmware to 247.1 but they cannot garantee that future automatic upgrades won´t affect the present firmware. For our system the downgrade was a hugh improvement. So I´m praying the next enforced upgrade is a long way off.
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I also got a downgrade to 247.1, which works fine for now, but I'm extremely disappointed that I probably won't be able to profit from future upgrades...1
