Over the holidays my electric baseboard (240V) stopped heating up. The thermostat on the wall was showing that the board is heating up but the baseboard remained cold.

I checked the breakers and it wasn't tripped, so convinced it was the old baseboard that finally (probably original to my 30-yr old house) gave up...I bought a new one.

Today I installed the new baseboard. The thermostat is showing again that the baseboard is heating up but it is not.

What else can I do to troubleshoot it myself.

Please advice.