I have this new, high voltage, thermostat connected and operational but it seems to have a flaw that would make any thermostat useless. When powered up and connected the thermostat gets warm to the touch, in the on or off state, to the point that it thinks the room on 30+c when it is actually 17c. It has calibration of +/- 9c, but while insufficient to match the real temp I also find the warmth fluctuates a few degrees, sometimes reporting 12 over, sometimes 7, etc.
Can anyone shed some light on this problem? I am unsure if I should try another zigbee or just go to wifi. I can’t imagine the zigbee portion is causing heat, but what to I know!
For what it’s worth my 9 Zigbee thermostats (a mix of Elko and Namron) are not hot to the touch at all @240V. Have you tried with the external sensor?
It may be worth calling a licensed electrician.
A thermostat typically has a low and high voltage side separated by a (latching) relay.
The low voltage side shouldn’t be generating significant heat, because it’s low voltage.
Heat is a form of energy/power, typically P = V * I
On the high voltage side, when the relay is:
Open - There is zero current (I), so there is no power.
Closed - There is (almost) no voltage drop across the relay (Vd ~= 0)
However if there is a bad connection on the high voltage side, there will be resistance which will cause a voltage drop and depending upon the amount of resistance, it could generate a significant amount of heat / lead to fire.
Hence my original point: Call a licensed electrician.
