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Old 06-25-2011, 09:05 PM   #1
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Dual AC Control

I have a 2002 Fleetwood Revolution and am having a problem with the dual ac. The thermostat seems to act crazy (cannot set temp most of the time, and it sometimes shows zone 3 when there isnt a zone 3). The units will come on for about 15 seconds then go off for about 15 seconds and so on. Anyone that can help is appreciated.
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Old 06-25-2011, 09:18 PM   #2
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Try doing a system rest first. Below is the procedure for a reset on a 5 button Dometic Comfort Control Center.


SYSTEM RESET
a. Turn the ON/OFF switch to .OFF. Position.
b. Simultaneously depress and hold the MODE and ZONE push-buttons while turning the ON/OFF switch to .ON.. FF should appear in the LCD display until the MODE and ZONE push-buttons are released.
c. When a dip switch is turned on or off after initial configuration, a system reset will need to be done before the Comfort Control Centerwill recognize the updated selection. See figure 11.
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Old 06-25-2011, 09:30 PM   #3
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Definitely need to reset the thermostat as the first action. What brand and model t-stat do you have? The procedure differs...
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Old 06-25-2011, 09:55 PM   #4
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The T-stat is a Coleman RV Comfort ZC
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Old 06-27-2011, 08:04 AM   #5
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I got this from another source - don't have that t-stat myself so cannot verify it works.

The reset procedure for the Coleman ZC is:

1 Switch unit to off

2 Open cover and remove fuse

3 Wait five minutes

4 Replace fuse

5 Wait five minutes

I have also read that they are sensitive to a nearby fluorescent fixture that has a bad ballast transformer. The electrical "noise" from the bad ballast can drive the ZC crazy (or so the article said). If you have a fluorescent fixtures, turn them off and see if the problem clears up (after doing the reset).
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Old 07-08-2011, 02:14 PM   #6
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Kenny, it's a known fluorescent ballast interference (with thermostat operation) issue...

1. Turn the thermostat "off"
2. Turn off ALL fluorescent lights
3. Wait 20 seconds
4. Turn thermostat/air condition(s) back on

"Ghost" zone 3 and possibly zone 4 may still be shown on the thermostat display screen, but this will not interfere with the operation. Just ignore it. To get rid of the ghost display, remove momentarily and re-insert the low voltage thermostat control fuse (under bed in bedroom).

At this point, you can isolate the culprit fluorescent light by turning each one (individually) "on," wait a few minutes, and see what light triggers the interference. In my case, both the bedroom and the kitchen lights were the culprit. I simply leave them off while running the AC. You may choose to replace the existing 12VDC/110VAC ballast assembly with 12VDC only lights.

Best,
Hovav
2002 Fleetwood Revolution 38B
Miramar, FL
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