Kenny

This thread has been a great help to me. I thought I would share my problem and fix in case it helps others. My wife and I recently bought a used RV. The previous owner had installed a Houghton AC/heat pump. On our first trip, I noticed the unit was cycling on and off about every 4 or 5 minutes. A post above stated that the manufacturer said that this behavior is normal when the temperature is near the setoint. I hung a Govee temperature logger from the AC unit. My unit was cycling even when the temp was far from the setpoint. As a test, I set the setpoint at 60 degF. The unit cycled when the temperature was 78 degrees and cooler. Needless to say, the unit never brought the temperature down to the setpoint. After much puzzling over the situation, I discovered the trouble. My system is a ducted version. When I removed the control panel/shroud from the unit, I discovered that there were two 2"x3" openings on the sides of the unit into the hollow ceiling. The hollow ceiling serves as a cold air plenum to feed the outlets in the ceiling of the RV. These openings were allowing cold air to short cirtuit back into the return of the AC. This was artificially lowering the temperature that the sensor in the return air stream was reading. I cut pieces of rubber and used aluminum duct tape to seal the holes. Problem solved! The unit will now run constantly and can cool like a champ! Another tip: Get yourself a Govee temperature logger or something similar. The Govee stores 2 years of data and lasts well over a year on a battery. I have this one https://www.amazon.com/dp/B07R586J37/ and a few other Govee models. Highly recommended for monitoring refrigerator temperture or anything else. The attached pictures may be enlightening. Sadly, I forgot to take pictures of my finished repair. I had installed the cover and 8 screws before I realized it. Again, thank you all for this very helpful thread! Happy Camping! Illustrations of cycling and slow temperature movement: Cycling beginning at 78 degrees F when setpoint is at 60 degrees. Before fix - 6 hours to drop from 71 to 68 during the night: After fix - 2 hours to drop from 77 to 63 during mid afternoon: Pictures of holes into the ceiling from the AC unit: With flash: