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I have no voltage to my thermostat - Dometic Rooftop RV Air Conditioner

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Hi, I am not positive the control voltage to your thermostat will be on a RV a/c, most homes are 24 volts. I know yours would be less. If you have a 2-wire stat and this a/c is not working, take the two thermostat wires a touch and hold them together. Don't worry as this is safe and will not shock you. If the unit comes on and runs, you do have voltage there but the meter may be set wrong. If nothing happens, then you need to find the breaker for this unit to see if it as tripped. Reset it anyway. If still no power, you will need to find the transformer for this unit and check for power to it which will be high voltage/primary and power out which is the secondary low voltage which controls all low voltage controls such as the stat. If you have a wiring diagram on the condenser up top or most RV have a large book that tells you about your coache. If you have a diagram look for the thermostat as it will be labeled in the legend as a T with a circle around it or it may say stat. Follow to see where it gos from there, to the transformer or what and let me know. If the unit does fire when you jump out the stat wires, you will have to replace the stat. Please keep me posted on this. You may have a blown fuse up top cutting off power to the transformer also. You can ohm them out also. Keep me posted so we can solve this.
Sincerely,
Shastalaker7

Posted on May 13, 2010

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http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

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http://waterheatertimer.org/How-to-clean-sediment-out-of-electric-water-heater.html

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The next switch you will test is the snap switch or thermostat. It is wired in series to the solenoid wires. If you have a thermostat test for voltage on the outgoing side. If you have voltage the wiring to the solenoid is bad. If you don't have voltage, test for voltage on the incoming line to the thermostat. If you have voltage your thermostat is bad. If not you need to test the flow switch. The process is the same if you have a snap switch however instead of testing the terminals you will test each wire going into the switch for voltage.

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This is a complete test of the burner circuit and should help you isolate your problem. If it doesn't feel free to contact me at 800.247.8103 and I will help you trouble shoot further.

Sincerely,
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www.landanw.com

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