Duo-Therm

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Duo-Therm

Home > Discussion Forum > Mechanic's Corner (general)

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All Messages in Thread	Author	Date
Duo-Therm	Don	8-21-01
My Fan runs but i can not get any cool air. I changed both Capacitors and still the same thing....please help me....
Re: Duo-Therm	Jmerritt	8-22-01
My Fan runs but i can not get any cool air. I changed both Capacitors and still the same thing....please help me.... Don, I was going to say try testing the capacitors, but you have already done that. From inside the camper turn the thermostat and listen for a click indicating the thermo making. If you hear a click and no compressor running then you have something wrong at the unit. If you don't hear the thermo click then you might have a bad thermo. If you are comfortable working with electricity and a meter you can troubleshoot the circuit. If you have the wiring diagram you should be able to see the thermo wiring and which wires are in the compressor circuit. With the unit off you should be able to jumper those two wires and then turn the unit on and hear the compressor. If you still don't get the compressor running then you will need to go up on top and have somebody work with yoy from inside. Trouble shoot the circuit at the unit. Remember that you are working with 115V so be careful. Some units, and I think Duo Therm may be one, use a timing delay in the circuit to allow pressures to equalize so that the compressor isn't starting against high head pressure. Check to see if you have a delay built in and bypass to test. Also, there is a compressor protection circuit that is made up of a temperature sensor mounted on the compressor. If it has opened due to heat build up and not reset, the compressor won't run. Again, check with your meter to make sure the circuit gets completed through that switch. If all circuits indicate power to the compressor and if it still doesn't run, which is unlikely, the compressor motor is cooked. If the compressor motor runs but still doesn't cool, check for dirt or blockage of the condensor coils. Also, check the fren lines to see if they are hot on the output side of the compressor and cold on the input. If not you may be in need of some freon, which requires special charging equipment. John