I have two roof heaters, each on its own circuit. It's been about a month since I used them, but the last time they were switched on they both worked well.
This morning I switched them both on when it started snowing. One of them stayed on, but the other now immediately tripped the circuit breaker. That's happened intermittently in the past, and was resolved by resetting the circuit breaker. This time resetting the circuit breaker doesn't work. I reset the circuit breaker 5 times, and each time as soon as I turned the roof heater back on it tripped the circuit breaker.
Any idea how I can find out why this is happening, and how to fix it?