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Old 12-08-2007, 04:59 PM   #1
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Hi All...I have two Duo-Therm A/c's with a two zone Du0-Therm Comfort Control. The rear a/c (zone 2)has a short on time of between 5-10 seconds. It shuts off and comes on again in about a minute. It occurs in AM and PM until I adjust the temp up or down.

Front one runs fine. Suggestions???

Thanks in advance..Enjoy your adventures....Fritz
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Old 12-08-2007, 04:59 PM   #2
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Hi All...I have two Duo-Therm A/c's with a two zone Du0-Therm Comfort Control. The rear a/c (zone 2)has a short on time of between 5-10 seconds. It shuts off and comes on again in about a minute. It occurs in AM and PM until I adjust the temp up or down.

Front one runs fine. Suggestions???

Thanks in advance..Enjoy your adventures....Fritz
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Old 12-08-2007, 06:44 PM   #3
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Hi Fritzo,
I had the same problem. I moved the thermistor to a location that stopped this from happening.

My thermistor was mounted on an outside wall. This seemed to create the sympton mentioned in your post. I purchased another thermistor/wire (it comes preassembled). I disconnected the original thermistor where is connected to the roof top AC/heat pump connection. Connected the new wire and ran it down the cold air return duct into the bedroom. I tried many locations for the new thermistor. All were better than on an outside wall, but none was to my satisfaction. The location that works the best is right above one of the cold air return vents. This is keeping the cycle times correct for the work the AC/heat pump must do to keep the room at a constant temperature. I enclosed the thermistor in a plastic tube (heat shrink plastic) wraped electrical tape around it and taped it to the top of the cold air return vent. I left the original thermistor at its' original location. It is disconnected and is not used.
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Old 12-09-2007, 02:30 AM   #4
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Fritz, If your thermistor (air temp. sensor) is on an interior wall you might check to see if the discharge vent is dumping air on to the thermistor. you might be able to adjust vent, otherwise relocating the thermistor should improve the cycle time if everything else is correct. Give us the model number and production number so we can look up more info if you need it.
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Old 12-13-2007, 10:59 AM   #5
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Mike..I did have a vent blowing in the direction of the sesnsor that is on an inside wall. I adjusted the vent and still have the problem.

The short cycle time only occurs early morning and late evening. I didn't have the problem until 2/3 months ago.

You were asking for the model number. WAs that on the thermostat? It's Model 50-981501-C, serial 041115 (those are on the circuit board).

The thermistor has a number on the wire feeding it. Is that what is necesssary? My guess is that it's just the type of wire. Thank you very much for helping.............Fritz
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Old 12-14-2007, 01:58 AM   #6
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Fritz, you will want to move the thermistor off the outside wall. I was looking for the model of the air conditioner itself but that is ok. How long have you allowed it to start up and cycle off before you manually turned the thermostat off and ran the temp up? Could it have had a loss of power for a fraction of a second and has gone into a time delay? See if the thermistor will pull out into the room a few inches, and retry operation. If it cycles off let it sit for five minutes and see if it will come back on. Let us know what happens.
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