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Sounds to me like a faulty temperature sensor, shutting off the heater before it should. Its detecting a higher temperature than there really is
So you have proven power is still at the heater?
What's the voltage?
Whats the voltage at the Heater???
I need to know. If its 240 there, then I need to know the resistance. If its 120 then you have other issues
That's fine. When the heater is on Check the voltage at the 2 nuts on the heater
Then measure the resistance in OHMS
What did you find out?