![]() ![]() The AC or heater do not come on - you have been able to set the temperatures for either one but when those temperature levels arrive the appliances do not turn on.The battery is out of power, the display screen doesn’t come on or it is dim if it does, etc. It has no power - Wires could come loose, a fuse breaks or it may be disconnected.The thermostat does not respond to your commands - you push the buttons and nothing happens.How do You Know if Your RV Thermostat is Bad? or go to the nearest Dometic dealer to see where you can get a hard copy. If you do not have a manual for this comfort control system, just click here to get a downloadable copy. When you see it is working right, re-program your settings to the levels you want. Test the system to make sure the system reset and is working. If it doesn’t do the same steps all over again. The light should go out and the mode should say ‘off’. When releasing the mode button you can release the up and down buttons. You only need to press that button once at this time. Now while the up and down buttons are still pressed, use another finger to press the mode button and release it right away. Then, at the same time, press the up and down buttons and hold. Press the mode button to activate the annunciator light. If they are, move on to step 2 and if they aren’t, consult your manual section 5.1. Turn the device on and the light and annunciator data are there. The steps are a little more involved than in the previous section. When you are going to do this action, remember that all previous program memory will be erased and the control will reset to factory settings of 72 degrees F for cool and 68 degrees F for heat. The reset system won’t work if you have a blown fuse, burned wiring, loose wiring, and other mechanical failures that impede the thermostat’s operation. That link takes you to their support page which has several more links to the support or other forms you may need along with links to their FAQ section and so on. Or you can contact the Dometic company at this link if the problem continues. Your system should be reset and ready to work. Hold the zone and mode buttons until these letters do appear, then release the buttons when they do. Depending on your model these letters could appear right away or in 15 seconds give or take a few seconds. As you are doing that the letters FF should appear in the digital display and will remain there until you release both the zone and mode buttons. Now at the same time press both the mode and the zone buttons while turning the switch back to On.
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