We went through heating issues last year. It turned out to be the circuit board behind the panel that covers the heater on the outside. The circuit board was corroded on the edge of the circuit board causing the solder traces to make contact with each other. I tried cleaning it but it was to far gone. Ordered a new one and it was the fix, Heat working again. The electric fireplace in the front living room doesn't exactly heat a 40' trailer very well!
