Stelpro releases the first Z-Wave Plus Line-Voltage thermostat: the STZW402+ Stelpro Ki Thermostat

Can anyone point me to good advice on how to install this thermostat on a double pole installation?

I’ve installed 2 of these thermostats at a prior condo, but my new condo has double pole installation and its confusing me a bit.

First attempt ended in a blown thermostat. A bit scary, but everyone is safe.

Second attempt at install was somewhat successful. It didn’t blow up, the baseboard heater begin to blow, but the screen on the thermostat wouldn’t light up at all.

I followed this wiring diagram:

FireShot Capture 029 -  -

As the weather is transitioning into spring, this isn’t a major priority right now. I also have a Daikin mini split which I will be using the majority of the time, but going forward I would like to update old Cadet thermostats.

The wiring diagram you shown is correct.
However, this line voltage thermostat is not intented for double pole installation since the thermostat is always powered on.

NOTE: I recommend that you call out for a professional electrician for the electrical wiring.

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A new update to the device controller in the new ST app appears to have disabled the ability to control the heat. Anyone else seeing this? I have 4 of these installed in a remote property 200 miles away so control over the set point is essential.


I am seeing the same thing here with my Orleans convectors, the adjustment buttons are missing!. Also, on a separate note (but possibly related) my Sensibo has no adjustment buttons.

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I have the same problem … As a temporary solution my “scenes” are still working to change the temperature so you might want to use that @clifster ?

Thanks @Keysheng. I still have the Classic ST app and integration is partially configured with Alexa. Both of those, ironically, continue to work just fine for manually adjusting temperature/settings. It’s just the modern first party app that’s failed.

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Exactly the same scenario for me - the new app shows the same as Clifster i.e. no ability to change temp. I still have the old app installed and that continues to let me change but as we know that’s end of life. The scene option is good to know thanks. Need basic functionality back

ST team are on top of this it seems see this other discussion here on same issue

A new update in the ST app appears to have disabled the ability to control the heat. I have 6 of these installed in a remote property so control over the set point is essential. Anybody have an update on what to do here. I was at my property over the weekend and tried r syncing them to the hub and no change.