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Main wire to heater getting hot/melting
I have a Rheem central heater a/c system for my house that is about 11 years old. The original issue was the breaker was tripping on my central heater. I reset it a few weeks ago and no issues. Now it trips after 5 minutes of operation. The main wire from the circuit breaker to the heater is hot to the touch and tripping the breaker. I can see signs at the end of the wire by the breaker of some melting and a black chared area from where it has melted slightly. What could cause this? I am no longer running the heater now that I saw this wire issue.