I have 3 new units. With new control boards and wiring. The Aquahot works correctly. And the front A/C works correctly. But zone 2 and zone 3 A/C will cycle on and then shut off and the hour glass will show up. And after a minute the A/c will come back on. I have checked the connections I am not noticing a drop in voltage along the connections and the temp sensors seem to be reading correctly.
Hi Rhoughton1,
If you have new A/C units, have you checked to see if the dip switches on the small red block are set properly for zones 2 and 3 on the roof circuit boards?
After checking that, you may need to do a reset of the 4 button thermostat:
If this is not your original thermostat or the zones and functions do not work normally, then do this reset procedure of the 4 button Dometic Comfort Control: 1 Connect the phone type cable to the back of the thermostat and turn on the power switch.
2 If possible, set heat and cool both to 70 degrees on any zone.
3 Next depress and release the mode switch - the display background light should come on.
4 Then depress and hold down together the two bottom buttons (up and down).
5 While still holding the two bottom switches add the third button from the bottom (mode button).
6 Release the mode button first.
7 Then release the two bottom buttons (up and down) together.
8 Depress the mode button momentarily. The display light should go off. If not, repeat steps 1 - 8.
This reset procedure programs your thermostat to your RV's systems and temporarily displays 68 F for the heating and 72 F for the cooling. Look for these temperatures as proof of a successful reset. Test all these functions on your RV - expect the usual 3 minute delay for the A/C compressors.
I presume your Dometic 4 button thermostat is working properly, if not, please call me a t 308-440-5154.
Jim
I have the comfort control center installed