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Old 04-14-2014, 07:46 PM   #1
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Two ACs Two Coaches Same Problem

My good friend just purchased a '14 Dutch Star and he mentioned this Rear AC Compressor cycles on and off regularly like 5 minutes on and one minute off and this continues until the system cycles off due to obtaining the designated temperature.

I thought that was funny until I ran my front AC on my '13 Essex and discovered it was doing the exact same thing...the Compressor ran for 5 minutes then off for 1 minute this cycle continued for 30 minutes as I had set the thermostat to 50 degrees.

Has anyone else had this problem??? I've got an appointment in 2 weeks to have it checked out.

Dan Leininger
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Old 04-14-2014, 08:00 PM   #2
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Had the same problem and it was as simple as directing the air vent away from the thermostat. Small problem but a big pain.

I hope yours will be an easy of a fix.
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Old 04-14-2014, 08:01 PM   #3
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Sounds like the temp sensor is too close to the cold air outlet--trips/tricks the sensor before the room has reached set temp.....
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Old 04-14-2014, 08:12 PM   #4
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That's interesting! I will cover the Temp Sensor and see if that changes things. What's amazing is that the cycles are almost exactly 5 minutes on and 1 minute off.

Also, I forgot to mention we both have the Penguin II
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Old 04-14-2014, 08:16 PM   #5
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Ours is not quite as severe but our bedroom sensor seems too far out of the normal flow of air thus causing heating and cooling to run a tad longer than needed while the sensor in the passage from the living room to the bedroom gets lots of air flow and cycles more than needed.
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Old 04-14-2014, 09:00 PM   #6
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As noted, first thing to check is if an air register is blowing on the thermostat or sensor.

Ken
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Old 04-15-2014, 07:45 AM   #7
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Hi danleininger,
I had the same problem with my bedroom unit. Tried the air direction change and covering the thermistor, but no luck. The thermistor seems to be ultra sensitive. I moved the thermistor (actually installed another thermistor) in the air return in the bedroom. The thermistor is wrapped in plastic (heat sink plastic) to dull the sensitivity. For about 7 years now, this setup has worked quite well.
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Old 04-16-2014, 10:48 AM   #8
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Quote:
Originally Posted by GaryKD View Post
Hi danleininger,
I had the same problem with my bedroom unit. Tried the air direction change and covering the thermistor, but no luck. The thermistor seems to be ultra sensitive. I moved the thermistor (actually installed another thermistor) in the air return in the bedroom. The thermistor is wrapped in plastic (heat sink plastic) to dull the sensitivity. For about 7 years now, this setup has worked quite well.
Great reply, Thanks. How on earth did you move the the Thermistor to the return air duct????

Dan Leininger
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Old 04-16-2014, 11:12 AM   #9
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I know what a thermostat is, and where my A/C temp sensors are, but what, (and where), are thermistors?
Wondering?
Thanks.
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Old 04-16-2014, 01:23 PM   #10
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Hi danleininger,
I purchased another thermistor from a Newmar dealer. The thermistor comes with quite a bit of cable. One end has the thermistor permanently attached. The other end has a connection for the HVAC unit. On my coach, the rear HVAC is directly over the rear bedroom. It was easy to disconnect the original thermistor, connect the new thermistor wire and drop the new thermistor and wire into the cold air return duct. Then it is a matter of pushing it over near the cold air return opening. Went inside the coach and removed the plastic cold air return vent. For once having long skinny arms paid off. I reached up, through the vent and retrieved the thermistor end of the cable. The bulk of the cable is laying in the cold air return duct. It took several attempts to de-sensitize the thermistor. At this time I have it inside heat shrink plastic (loose do not shrink). For me this works. One may need to get creative with how to de-sensitize the thermistor to one's personal preference.
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Old 04-16-2014, 09:32 PM   #11
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Very, very interesting!!!!!

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Old 04-17-2014, 09:29 AM   #12
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Dan,
Wait a minute... If the room thermistors were the culprit, due to cold air blowing on them, then you would see the "zone" temperature achieving "set" temp on the RV-C display! When we picked up our 2011 Essex, I noted that the forward cabin air conditioner compressor was cycling, WITHOUT reaching "set" temp as indicated on the RV-C display. When the technicians dug into the issue, they found the forward cabin air conditioner RV-C communication line was incorrectly routed and connected to a "dead" board. The technicians ran a new RV-C communication line and connected it to the correct RV-C module and solved the issue! I should also note, our Essex was the first Essex to have the RV-C system installed.
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Old 04-17-2014, 10:21 PM   #13
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Yeah, I get a similar short cycling of the units and my thermisters are quite some distance from the supply ducts. Maybe I also have a "line" problem?
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