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I need some help with a 240V baseboard heater problem...

I bought two smart thermostats for my home. I installed the first one and it powered on as soon as I flipped the breaker back on. Turned the breaker back off, and installed the second one. Flipped the breaker on and it worked too - yay for the rookie DIY electrician! But, wait - I went back and looked at the first thermostat, and it was no longer powered on. I turned the power off again, checked the incoming feed and there was no current flowing through it.

I then went back to the second thermostat and noticed it had one extra pair of wires... I didn't notice this when I installed it and connected everything per Mysa's instructions - as if the thermostat was controlling three baseboards (it only controls two). Looks like this thermostat is sending power out to the the other thermostat. So, my question is twofold - How do I determine which pair of wires is feeding power to the other thermostat, and then, how do I wire it properly?

Each thermostat is controlling two baseboard heaters and they are connected as per the attached diagram (except for the extra pair of wires on the one which was connected as if it was a third baseboard).

Thanks in advance!

Rick
 

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I need some help with a 240V baseboard heater problem...

I bought two smart thermostats for my home. I installed the first one and it powered on as soon as I flipped the breaker back on. Turned the breaker back off, and installed the second one. Flipped the breaker on and it worked too - yay for the rookie DIY electrician! But, wait - I went back and looked at the first thermostat, and it was no longer powered on. I turned the power off again, checked the incoming feed and there was no current flowing through it.

I then went back to the second thermostat and noticed it had one extra pair of wires... I didn't notice this when I installed it and connected everything per Mysa's instructions - as if the thermostat was controlling three baseboards (it only controls two). Looks like this thermostat is sending power out to the the other thermostat. So, my question is twofold - How do I determine which pair of wires is feeding power to the other thermostat, and then, how do I wire it properly?

Each thermostat is controlling two baseboard heaters and they are connected as per the attached diagram (except for the extra pair of wires on the one which was connected as if it was a third baseboard).

Thanks in advance!

Rick
Since you are a DIY you probably don’t have a multimeter or an amprobe which is devises used to measure electricity. The only advice that I can give you is hire an electrician
 

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