Having problems with your Air Conditioners ?
Problem, no heat
The fuse is a 110 volt breaker in your service panel. If your heat comes from the heat strip it is inside of the ac in front of the evaporator. If it is a heat pump thats the the compressor. To create heat the compressor runs in reverse. There is a directional relay operated by the circuit board and thermostat to tell the ac what you are calling for, heat or ac. The heat strip is connected to the circuit board and is also operated on 110 volts. You have one of three problems. Breaker tripped, bad heat strip, bad circuit board. Possibilities, find the heat strip cable and unplug and plug it back in a few times,maybe lost connection. That happens at times because of the warm and cold elimates. The heat strip can be tested by takeing it out and bench testing it with 110 power. circuit board can be checked by use of a volt meter, turn the ac to heat and check the pins where the heat strip plugs in. To chech the heat pump you must go up top, remove ac cover and with an amp clamp find the wires going to the compressor and put the amp clamp on one wire only. Amps should be no more than 7 amps. If it is the compressor is shot. If there is no reading then the compressor is not running. Now you may have a bad capacitor which is up top under a sheet metal cover. They also can be tested with a VOM. You will find 2 or 3 capacitors depending on model. Run and start. Capacitors typically are charged with 370 to 600 Volts. They will knock off the top of your camper. BE AWARE OF THE FACT YOU ARE DEALING WITH 110 VOLTS. IF YOU ARE NOT FAMILIAR OR COMFORTABLE GET SOME QUALIFIED HELP. GOOD LUCK
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