heating does not turn off defective relays or software problem ?
I have my Tado thermostat for a bit over 2 years now, and the heating does not turn off anymore.
The central heating system is connected on the common and normally open connectors of the thermostat.
When I set the temperature to minimum, or off, the heating system keeps on going.
I don't hear the relays clicking when I change the temperature settings between off - minimum and maximum temperature, and when I measure the resistance between the common and normally open pins, it is always closed, and this is also the reason why the heating does not switch off anymore.
So I suspect either a defective relays, or a software problem, where the software does not drive the relays on or off anymore.
When i connect the wires of the heating manually, to switch it on, the current is 0.4A, and when I disconnect the wires, the voltage is 230V AC, so this is well within the specifications of the thermostat, and should not damage the relays contacts I suppose ?
I am starting to doubt the Tado build quality, as when I ordered it, I immediately had to return it because of a bad soldering of the pins that connect to the screw connector, on the printed circuit board of the thermostat, and now, a few months after warranty expired, there seems again to be a hardware problem.
My previous thermostat, which is also equipped with a relays, and is over 30 years old is still working fine and driving the heating system in the house of my daughter, whereas the new Tado thermostat already had 2 defects now.