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Old 09-25-2020, 07:28 PM   #1
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Dometic A/C Freeze Sensor Questions

I've been having some problems with the front AC. All 3 of my ACs are the original Dometic Penguin 1 low profile 15K BTU heatpump units that have been modified to work with the new CCC2 programmable thermostat. They have been working fine for nearly 4 years.

The first and oldest problem was that the fan would intermittently continue to run even though the compressor stopped (yes it was set to auto). The second (newer problem) was that the compressor would quick cycle. When the compressor shut down there would be an hourglass on the thermostat. The front of the coach would not cool down. We are spending the summer in Taos, NM and it gets hot here.

Dometic suggested that I replace the control board. I did and that took care of the fan running problem but the quick cycle problem remained.

Today, I removed the freese sensor from the fins and just left it dangle. The AC has been running fine ever since and it blows the same amount of air and the same temp air as the other two units. BTW: I watched the unit cycle with the outer and inner covers off, nothing was freezing up as far as I can tell.

I have a couple of questions for your AC knowledgeable people:

I suspect it is a bad freeze sensor... Thoughts?

Will leaving the sensor dangle and running the AC until I can get it replaced hurt anything?

I read that the sensor was supposed to be at the bottom center of the coils. Mine was about half way up on the left side. Could that be the problem?

Thanks
-B
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Old 09-26-2020, 07:07 AM   #2
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Place a thermometer where the sensor was and different places on the coil to see if there's a better place for that freeze sensor.
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Old 09-26-2020, 07:23 AM   #3
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"I read that the sensor was supposed to be at the bottom center of the coils. Mine was about half way up on the left side. Could that be the problem?"

Half way up is the correct position for the sensor. Without one in place the unit will run but could possible freeze up the entire coil and not shut off the unit.
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Old 09-26-2020, 07:53 AM   #4
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Quote:
Originally Posted by Dutchstar411 View Post
Half way up is the correct position for the sensor. Without one in place the unit will run but could possible freeze up the entire coil and not shut off the unit.
If that is all that can happen, I am OK with it. As is was, it was not running enough to cool the coach. With it dangling, the AC is working great and no freeze ups... yet. I suspect that the sensor is bad. For under $30, I'll replace it and see what happens.

-B
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Old 09-26-2020, 07:55 AM   #5
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Originally Posted by Jyrocharlie View Post
Place a thermometer where the sensor was and different places on the coil to see if there's a better place for that freeze sensor.
When I removed the covers and watched the coils, there was no frost and no reason for the compressor to shut down. So I don't think moving it would help. I'll get a new sensor (for under $30) and see if that fixes it.

-B
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Old 10-09-2020, 08:32 AM   #6
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I installed the new freeze sensor (Dometic 3312303005 Thermistor.) The AC seems to be working OK. It blows cold air and does not rapid cycle the compressor anymore. It has not been that hot out so I am not 100% sure it is fixed.

Stay tuned.

-B
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Old 10-09-2020, 11:15 AM   #7
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Hi - Just be aware that if your unit does freeze without the sensor attached you run the risk of destroying the AC unit. The ice can cause the coils break as it expands. That's why it's there in the first place. When the sensor "sees" ice it shuts off the compressor so that warmer air can defrost them or reverses the unit depending on mode and model.


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Old 10-10-2020, 06:23 PM   #8
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Quote:
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Hi - Just be aware that if your unit does freeze without the sensor attached you run the risk of destroying the AC unit. The ice can cause the coils break as it expands. That's why it's there in the first place. When the sensor "sees" ice it shuts off the compressor so that warmer air can defrost them or reverses the unit depending on mode and model.


Tom
I suspect it was freezing up a bit with the sensor just hanging loose. The airflow would drop a little and the air did not feel that cold. It has been cooler here so I did not need to run that AC, the other two would carry the load. Since installing the new sensor, the AC is running great. No cycling and plenty of cold air. If the problem returns, I'll probably replace the AC unit.
-B
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