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 > Help with A/C freezing up ..

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ford truck guy

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Posted: 06/07/20 04:41pm Link  |  Quote  |  Print  |  Notify Moderator

My brother in law swapped his 13.5 A/C last year for a brand new 15k A/C at a local RV repair. That place is now closed and he had an issue this past weekend..

We were camping in 90* weather Friday and Saturday with NO Issues... a front came through last night and took the humidity and heat away with temps in the 70*'s this AM.. He had cool air blowing, but it was not blowing hard... went up on the roof and his lines inside the shroud were all frozen...

He is 50 amp with 2 A/C's and was plugged into 30 amp service so was only using 1 AC..

Any ideas on what may be happening...


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bob213

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Posted: 06/07/20 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

Fan not on high or auto? Freeze sensor dislodged from correct place?


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ford truck guy

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Posted: 06/07/20 05:10pm Link  |  Quote  |  Print  |  Notify Moderator

bob213 wrote:

Fan not on high or auto? Freeze sensor dislodged from correct place?


Bro in law was not sure, sis in law THINKS it was on high, but not sure..

I will say this, I kept experiencing "LOW VOLTAGE" as my Progressive Industries shut me down 3 - 4 times due to low voltage... Could that have been the issue?

ken56

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Posted: 06/07/20 06:03pm Link  |  Quote  |  Print  |  Notify Moderator

Worst case scenario is it has a refrigerant leak and it is low on refridgerant. These are sealed units and not serviceable. Best case is it's just the fan setting. The fan MUST be on high.

* This post was edited 06/08/20 06:14pm by ken56 *

time2roll

Southern California

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Posted: 06/07/20 06:13pm Link  |  Quote  |  Print  |  Notify Moderator

Remove the lower trim and inspect the evaporator for ice. If it has a wall thermostat look for the freeze sensor and get it placed in the ice. Also check the plenum divider is placed correctly and sealed to properly separate the air-in vs air-out.

You can cycle it yourself to clear the ice by leaving fan on high and cycling the compressor off. Or alternate the air units every 30 to 60 minutes.


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theoldwizard1

SE MI

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Posted: 06/07/20 06:52pm Link  |  Quote  |  Print  |  Notify Moderator

Freeze up is usually caused by low refrigerant.

colliehauler

Mc Pherson KS USA

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Posted: 06/07/20 10:06pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Freeze up is usually caused by low refrigerant.
This would be my guess as well.

prichardson

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Posted: 06/08/20 07:11am Link  |  Quote  |  Print  |  Notify Moderator

What temperature did he have his thermostat set at? Trying to keep it too cold at lower ambient can lead to freeze up; however, the frost sensor (if there is one) should prevent it. Doubt if it low refrigerant as it is a new unit. Poor installation leading to re-circulation or restricted airflow could also be the problem.

AJR

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Posted: 06/08/20 07:23am Link  |  Quote  |  Print  |  Notify Moderator

The only time I had the main AC start to blow cool air slowly. I removed the filter. Took a flashlight and peered into this hole with a mess of wires in it. I could make out the surface of the cooling coils (if that is what they are called) covered with ice off to the side. Hum… I guess I need to run the fan only till the ice melts. I started to look at the connections I could see hoping to find something lose. Then I noticed a wire dangling that looked like a sensor.

After the ice melted I could see where the sensor must have been placed in the cooling fins. I picked a spot close to the original and pushed the sensor into the fins. Problem solved. I have always run the fan on high speed.


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2chiefsRus

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Posted: 06/08/20 09:38am Link  |  Quote  |  Print  |  Notify Moderator

ford truck guy wrote:

bob213 wrote:

Fan not on high or auto? Freeze sensor dislodged from correct place?


Bro in law was not sure, sis in law THINKS it was on high, but not sure..

I will say this, I kept experiencing "LOW VOLTAGE" as my Progressive Industries shut me down 3 - 4 times due to low voltage... Could that have been the issue?


Does brother in law not have a Progressive unit to detect low voltage? Hope he didn't damage the air conditioner.


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