Originally Posted by beenthere
Generally makes no difference which load wires you use. Sounds like a short in the thermostat or its wires.
Those heaters are wired in parallel. Seies with the relay, parallel to each other. If they were wired in series. You would get very little heat.
There definitely is heat, so they are not in series.
I took the thermo out of the mix by disconnecting the wires at the thermostat, so that should prevent the baseboard from heating up, but it doesn't.
That makes me think the relay is bad or miss wired.