Dometic RV AC Freeze Sensor Location (Test and Install Guide)

When it comes to finding sensors, this can be somewhat of a guessing game. Many people will venture a guess as to a part’s location but really do not know where it is. Once you find it, like the AC freeze sensor, you realize it is in a very good spot.

The correct location for the AC freeze sensor is halfway up the coils on the left-hand side. Its duty is to make sure those coils do not freeze. If they do, you could damage your AC unit and have to replace it. Or it may not shut the AC unit off.

To learn more about this part and its location and purpose, just continue to read our article. It has the information you want to know about so you can find the p[art easily and replace it even quicker. Its cost is supposed to be under $30.

Where Is The RV AC Sensor Located?


This little part is located in the main unit of your air conditioner. It sits about halfway between the ends of the coils and monitors the temperature levels in that area.

If it does not do this job, then your AC unit may never turn off and your coils may freeze. The sensor looks like a small probe that is attached to the coils or nearby with a thin wire.

If it breaks down or starts to go on you, you may experience different temperature levels depending on what is wrong with it. When you have problems with the AC unit running as it should, then check this part first. One owner did and he moved it to a new location which solved his problem.

Not every fix will be that simple though and you may be directed to change other parts like the control board before addressing the sensor.

Dometic Freeze Sensor Location

The freeze sensor seems to have different duties. Not only does it watch out for the coils and the possibility that they will freeze, but it also watches your cycles. If this part is not working right you may be experiencing quick cycles.

The sensor is not hard to find. You just have to take the top of the unit off and slide it down to where you can work on it. Once you open up the AC unit you should find the sensor right next to the coils.

Dometic may have placed it on the left side for all of its AC units but if it isn’t there, check the other side. Also, it should be in the middle of the coils where it can get the best temperature reading.

Once you find it, it won’t be difficult to pull it out and put a new one in its place.

Furrion AC Freeze Sensor Location


This company takes a different approach when it comes to locating parts. It seems that their temperature or freeze sensor is way up in the AC unit near the fan. The only way for it to judge the air temperature is to turn the fan on and let the air blow by it.

It also may be up by the AC filter. There are different sensors in the AC unit including a room sensor which is attached to the freeze sensor by the same wire. This system is a little more complicated as you have to dig around a little to find every sensor Furrion has placed in their AC/heating units.

Once you find it, relocating the sensor to a better spot is not a difficult task. It is just a little tedious and time-consuming. It should take less than 30 minutes or so to get the fix done right.

How do You Test An RV Freeze Sensor?

Go to the control board and find the two wires going to the freeze thermistor. Now you can either jump the two wires or unplug the thermistor from the control board. Either way should bypass the thermistor.

The compressor should turn on at this point. If the compressor runs and does not shut off, then the freeze thermistor is bad. But if you have the 10-key control pad, then the compressor will need the OHM feedback or it won’t run.

In this case, use your meter to find the resistance. If that is not correct, then you have a problem with the freeze thermistor. How you test your freeze sensor will depend on the unit you have.

Check the owner’s manual for your system to see if they provide any instructions. If not then go to your dealer for help or call your manufacturer directly for help.

Dometic AC Freeze Sensor Test


You can probably use the previous instructions to test your Dometic AC freeze sensor. It doesn’t take much to disconnect the sensor to see if there is a problem with it. If the compressor does run and does not shut off, then you do have a bad sensor.

Dometic does not like to give answers to the general public. One owner found out the hard way when they refused to answer his questions since he was not an official repairman.

To get specific details on how to conduct this test, talk to a Dometic repairman. He will have Dometic’s instructions and can help you get the test done correctly.

The key to knowing something is wrong is by looking at your coils. If one side is freezing up, then you are going to have a faulty freeze sensor. This is due to the location of the sensor. Sometimes, you can move it and everything will work fine again.

It is recommended that you try moving it first to see if this solves the problem. That way you do not have to go to the repair shop for help.

Where Should I Place My Freeze Sensor?

The right location, and where you will find most of these sensors are in the middle of the coils. But you may not always find it there as a couple of owners found them near one end of the coils.

There are different relocation placements you can do as some owners have found out. The problem is that not every location will fix the problem for every owner. There are relocation kits you can buy to help you find the right placement for the sensor.

Some owners have just let it hang out of the AC unit into the room and they say it works fine for them. Others push it up further into the AC unit and get the same results.

The right location is in the middle of the coil on the left side of that device. If the sensor is not working there, make a few location adjustments until the AC unit works correctly. Just be forewarned that potential freezing can happen when you move the sensor.

Dometic AC Freeze Sensor Installation


The sensor is supposed to clip right onto a coil fin. This is a very simple installation method that should not take a lot of time. The most time is used by removing the AC unit, opening it up, and then putting it back in place.

There should be a blue plastic piece attached to the bottom of the sensor. That should be your clip to attach it to the coil’s fin. Just put it on the fin and it should hold the sensor in place.l

While there are different locations where you can put this sensor, it is best to be in the correct position. Some people just let it hang in place and that Is not always good.

Where is The Temperature Sensor On An RV AC Unit?

The sensor should be in the rooftop AC unit. Usually, it will be located close to the coil. Sometimes it is in the middle, sometimes, it is at one end, and sometimes you may just find it hanging around.

It does take some effort to get to the sensor when it is in the right location. But once you find it, it is easy to replace. It is not a part you can repair so replacement is your only option.

But there is one thing you should be wary of. If you are having trouble with fans not turning on or off, quick cycling, etc., it may not be the freeze sensor that has gone bad. It can be any number of parts that are not operating as they should.

Some Final Words

The standard location for the freeze sensor is next to the coils. Its job is to detect ice and shut the compressor off when it does. This may not happen every time because the sensor may be in the wrong location or has failed on you.

Test the sensor to see if it is the part that needs repairing, and if it does, the cost of a new sensor is reasonable and affordable. It also is a quick repair task.

Leave a Comment: