Furrion AC short-cycling

**Kleinisrad** · 07-18-2021, 05:33 PM

Sorry, did not see all the replies to your original post regarding AC shutter...

**Rabbit** · 07-18-2021, 05:54 PM

The Furrion AC has the temp sensor inside the air intake plenum. If you run it on automatic it will short cycle. The bedroom units are not ducted so you have to run them with the dump/shutter open. Unfortunately that allows the cold air to be immediately drawn back into the inlet Jensen the short cycling. Furrion claims you cannot use the automatic setting. Only the hi or low. Terrible design. The main living area AC is ducted so it will work better. But the probe in the intake plenum causes even that unit to be unresponsive to the interior temp rising above the set temperature. And by the way, this poor design causes issues with heating. The furnace will run longer than it should unless the AC fan is running on hi or low.

I’m in the midst of a back and forth with both Furrion’s and Grand Designs tech and customer service people. Problems not yet solved.

**Rabbit** · 08-29-2021, 08:36 PM

Update: my information is wrong. Both the AC units feed one common duct system.

**traveldawg** · 08-30-2021, 07:19 AM

I'd like to add few things I didn't see when reading this thread....

> Be sure the vents that vent out the cold air from the ceiling ducts are not pointed at the thermostat. Proper pointing will help distribute the cold air and keep it from directly hitting the thermostat.

> Consider running just the living area AC at nite when sleeping. Because of the duct system that GD uses, cold air will reach the bedroom and very likely keep you cool enough at night.

Best wishes with the new rig. All this is just part of learning the new RV and what works best for you.

**dryfly** · 08-30-2021, 09:45 AM

When running the thermostat on "auto" this refers to the fan only, not the compressor. Right? It's always been my understanding that by running the fan on "manual" (continuous) that it will help prevent freezing of the coils.

I've always ran my thermostat fan control on manual, and even though a little noisy, it seems to be more effective, and not hearing the A/C cycle is less annoying to me.

**traveldawg** · 08-30-2021, 03:08 PM

Originally Posted by dryfly

When running the thermostat on "auto" this refers to the fan only, not the compressor. Right?
yes - fan only.

It's always been my understanding that by running the fan on "manual" (continuous) that it will help prevent freezing of the coils.

I've always ran my thermostat fan control on manual, and even though a little noisy, it seems to be more effective, and not hearing the A/C cycle is less annoying to me.

I often run the fan on manual too so the sound level inside is more constant. And we run the fan on manual at night too when sleeping so avoid having to hear the AC system starting and stopping.

**zzzberdi** · 09-04-2021, 12:36 PM

Our Furrion is doing the same. Compressor cycles off and on, constantly, even when set temp not met. Compressor never on for more than 1-2 minutes. We have tried fan set on low, high and auto with no change. We contacted GD and they sent us temp sensor relocation kit. Directions unclear as to where you are suppose to relocate to. Has anyone install one of these kits? Did it fix the problem?

**Rabbit** · 09-04-2021, 04:23 PM

Yes, installing the kits solves the short cycle problem and provides more accurate temperature control. There is no established place to relocate the temperature sensor other than to place it as close to the thermostat as possible. I have a 2022 3100RD. The main AC sensor is opposite the entry door on the side of the cabinet over the sink. The bedroom sensor is on the wall just above the thermostat. Exposed wires are inside white plastic conduit I bought at Lowe’s.

**El_Supremo** · 09-05-2021, 06:19 AM

Ours seems to be working very well now. I pulled the temperature sensor down through the filter/grate, and we close off the dumps and run both with the fan setting on low at night. I have noticed that without airflow over the temperature sensor, the unit doesn’t sense the room temperature correctly. The sensor relo kit sounds interesting, unless there’s exposed wiring. Any pics of this?