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Topic: Dometic A/C issues (Read 378 times) previous topic - next topic

Dometic A/C issues

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.
1998 Foretravel U320c
4200 RCFE  unit # G5341

Re: Dometic A/C issues

Reply #1 –
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
Jim Frerichs
2002 U320 42'

Re: Dometic A/C issues

Reply #2 –
I have the comfort control center installed
1998 Foretravel U320c
4200 RCFE  unit # G5341