The air conditioner froze up last night. I am guessing it was because I had the thermostat turned down to low. I found that the fan was running but very. Little air was coming out. This is a 2008 keystone cougar 276rls 5th wheel.Any suggestions would be appreciated. We can't stop to have it fixed because of an important meeting in southern ( yes, we know it's going to be VERY HOT) California.Thanks for any help.Danglo

What is the make/model of the air unit? Wall thermostat?

In humid condition an AC will freeze up when you run it on too cool a setting. Just back off the thermostate and let it run and thaw (cycle) and you'll be ok.

X2 to humidity levels causing freeze ups. back off and let it thaw out.

1. you didn't tell what type of AC2. do you have a wall thermostat?3. Take the cover off where the filter is and see if the freeze sensor (if you have one) fell out of the coils. If you have one there should be a small sensor stuck in the middle of the coils behind the filter. If it fell out, stick it all the way in, you should see where it was before.

Air conditioner freezes up | Good Sam Community

13 Replies

Learjet
Explorer
Jun 30, 2013
every time I clean the filter I make sure it hasn't moved or come out of the coils. In fact, I just clean the filter and check the freeze sensor and it's ready for max cooling. :B
peirek
Explorer
Jun 30, 2013
Dave H M wrote:
Scott sand learjet have the first place I would always recommend to look. Mine was dangling down and I stuck it back in the coils and all is happy. No hocus pocus involved. :W

X2
Happened to me this spring.
Dave_H_M
Explorer II
Jun 30, 2013
Scott sand learjet have the first place I would always recommend to look. Mine was dangling down and I stuck it back in the coils and all is happy. No hocus pocus involved. :W
ScottG
Nomad
Jun 30, 2013
dougrainer wrote:
RV Roof Ac's with wall tstats will NOT NOT NOT freeze up as they have freeze sensors. Regardless of ANY humidity/fan speed, ANYTHING. That said, IF you have a freeze up it is because your Freeze sensor has either failed or is not in the correct mount place for it. Doug

Best answer!
The one time mine froze up I found the sensor just hanging inside the AC. Once I installed it back onto the coils there was no more problem.
dougrainer
Nomad
Jun 30, 2013
RV Roof Ac's with wall tstats will NOT NOT NOT freeze up as they have freeze sensors. Regardless of ANY humidity/fan speed, ANYTHING. That said, IF you have a freeze up it is because your Freeze sensor has either failed or is not in the correct mount place for it. Doug
wolfe10
Explorer
Jun 30, 2013
Freeze up can occur when thermostat is set too cold, OR air flow is too low to keep evaporator temperature above freezing (or a combination of the two).

In addition to thermostat setting, check that the return air filter(s) are clean, fan speed is at least medium or better, high and that all vents are open.
M_GO_BLUE1
Explorer
Jun 30, 2013
Chuck&Gail wrote:
Also always run fan on high when freezeup likely. Much less likely to freeze up with more air movemant. Common problem with low fan speeds.

x2
Chuck_Gail
Explorer
Jun 29, 2013
Also always run fan on high when freezeup likely. Much less likely to freeze up with more air movemant. Common problem with low fan speeds.
Learjet
Explorer
Jun 29, 2013
1. you didn't tell what type of AC

2. do you have a wall thermostat?

3. Take the cover off where the filter is and see if the freeze sensor (if you have one) fell out of the coils. If you have one there should be a small sensor stuck in the middle of the coils behind the filter. If it fell out, stick it all the way in, you should see where it was before.
TexasShadow
Explorer II
Jun 29, 2013
oops, double post