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04-05-2016, 04:07 PM
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#1
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Front AC Freezing up
Im still in Alabama and have had to start using air conditioning more. The thermostat on zone 1 controls front AC. The temp setting is way off. Example, inside temp shows 83° AC set to cool 73° it never makes it without freezing up! Apparently its not cycling through defrost mode during cooling process. Any ideas or tricks? Rear unit works great.
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-05-2016, 05:19 PM
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#2
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Commercial Member
Join Date: Nov 2007
Location: Bristol, IN
Posts: 19,004
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Make sure the return air is not clogged in any way. Is the fan "ON or Auto"?
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04-05-2016, 06:16 PM
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#3
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Frost sensor may have fallen off.
2008 2500hd Duramax
2015 Columbus 320RS
2016 nights camped "0"
2015 nights camped "34"
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04-05-2016, 06:36 PM
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#4
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Senior Member
Join Date: Feb 2015
Location: Florida
Posts: 250
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Along with the other suggestions, make sure there are no holes in plenum between the air exhaust and air intakes.
-R.Jones
Nitro 31FQSL
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RJones
2016 Nitro 31FQSL
2017 2500 Denali Duramax
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04-05-2016, 06:42 PM
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#5
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Does your unit have the quick cool dump?
2008 2500hd Duramax
2015 Columbus 320RS
2016 nights camped "0"
2015 nights camped "34"
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04-05-2016, 08:29 PM
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#6
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Thanks for the replies as always.. yes air return in good shape. Unit was set on auto, yes sensor is in place, higher than one shown in picture. Mines in the center of coil located in the middle. Turbs, quick cool dump? you're talking bout defrost mode right? not sure I've heard it called that. At any rate something is not doing what its supposed to. Works great in lesser Temps.. rear unit works great no matter what the temp.
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-05-2016, 09:12 PM
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#7
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Front AC Freezing up
Does your ceiling cover look like this?
2008 2500hd Duramax
2015 Columbus 320RS
2016 nights camped "0"
2015 nights camped "34"
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04-06-2016, 09:51 AM
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#8
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Turbs, what your showing looks to be from a duo therm ac unit. Mine are Coleman Mach Airxcel 4700 series
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-06-2016, 09:55 AM
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#9
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Ok well I didn't know what you had and was wondering.
3 causes of freeze up
1) not enough air flow or restricted air flow. I.e. To many vents shut off or a blockage in the ducting.
2) frost sensor inoperable or fallen off.
3) unit is low on refrigerant.
2008 2500hd Duramax
2015 Columbus 320RS
2016 nights camped "0"
2015 nights camped "34"
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04-06-2016, 10:09 AM
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#10
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Thermostat reading is different than what I get from temp gun as shown. Also wall senor different from thermostat. I beginning to think I have a bad thermostat. The rear ac unit zone 2 is right on the money.
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-06-2016, 10:20 AM
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#11
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Senior Member
Join Date: Jan 2016
Location: Phoenix, Arizona
Posts: 306
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Quote:
Originally Posted by TURBS
Ok well I didn't know what you had and was wondering.
3 causes of freeze up
1) not enough air flow or restricted air flow. I.e. To many vents shut off or a blockage in the ducting.
2) frost sensor inoperable or fallen off.
3) unit is low on refrigerant.
2008 2500hd Duramax
2015 Columbus 320RS
2016 nights camped "0"
2015 nights camped "34"
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4) restriction in refrigerant line
5) thermostat not shutting off compressor
sounds to me like your stat is keeping compressor on too long bringing the evap temp below freezing
__________________
2016 Forester 2401WS MBS
Life is short...eat the cookie
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04-06-2016, 10:26 AM
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#12
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by bob dirt
4) restriction in refrigerant line
5) thermostat not shutting off compressor
sounds to me like your stat is keeping compressor on too long bringing the evap temp below freezing
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Thanks Bob [emoji106]
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04-06-2016, 10:30 AM
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#13
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Commercial Member
Join Date: Nov 2007
Location: Bristol, IN
Posts: 19,004
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Could be location of remote sensor.
If I read your pictures correctly...the t-stat says 74, but in fact the room is 68? The T-stat is not really reading the temps in most cases because we put it behind a door. There is a little plastic "eye" looking thing. Either that is malfunctioning or something is keeping it artificially heated.
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04-06-2016, 12:20 PM
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#14
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Senior Member
Join Date: Sep 2015
Posts: 158
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AC freezing
While any AC can freeze up under the right conditions I am concerned that your freezing unit may not be charged properly since your back one is working fine under the same conditions. Usually happens when the charge gets a little low due to a pin hole somewhere in the system but I hope I'm wrong since they can be very hard to locate.
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04-06-2016, 12:41 PM
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#15
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Senior Member
Join Date: Jan 2015
Location: West Michigan
Posts: 641
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Quote:
Originally Posted by bclemens
Could be location of remote sensor.
If I read your pictures correctly...the t-stat says 74, but in fact the room is 68? The T-stat is not really reading the temps in most cases because we put it behind a door. There is a little plastic "eye" looking thing. Either that is malfunctioning or something is keeping it artificially heated.
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2X any heat source that may influence the remote sensor (television, coffee pot, computer monitor ext) anything that can produce heat. what is the wall temp remote temp sensor mounted to? Remote temp sensor battery's are in good shape if sensor has them? Dose the coil freeze up with out door air temps above 75-80 deg? Or at night? Air filter is clean Cooling coil is clean? fan speed is on high or low? Air flow is very important for the air conditioner to function properly. Low room air temps of 65-68 deg will lead to coil freeze ups as the refrigerant temp inside the cooling coil will or may drop below freezing with this cold of air temp entering the cooling coil. AC units are designed to operate at room air temps of 72-75 deg.
Hope This Helps Tim
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04-06-2016, 05:44 PM
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#16
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Quote:
Originally Posted by bclemens
Could be location of remote sensor.
If I read your pictures correctly...the t-stat says 74, but in fact the room is 68? The T-stat is not really reading the temps in most cases because we put it behind a door. There is a little plastic "eye" looking thing. Either that is malfunctioning or something is keeping it artificially heated.
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The third picture is the small sensor located near the thermostat. You are correct the thermostat is enclosed and ubable to correctly diaplay inside temp. I left the door open today and it gas worked fine.
Its not been as hot today but has cycled fine. Both output temps of both ac units are the same. I don't believe there's a freon leak. I believe the problem lies within the thermostat.
Yes, I did run fan on high today, yes the filters are clean, thanks for the replies.
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-06-2016, 05:53 PM
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#17
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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I'm going to give the sensor the hair dryer test to start compressor. It should within minutes equalize and shut off.
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-06-2016, 06:29 PM
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#18
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Okay heres what I believe is happening. The hair dryer test confirms the senor is working as it should. Notice in the picture the location of the sensor and the thermostat. When taking temperatures with my temp gun I noticed the interior bulkhead temp was 86°. That sensor is giving a false reading due to its location. I took several readings today. When that thermostat door is closed and the sun is shining on that outter wall the sensor temp was 7°-10° higher than actual room temp.. thus AC confused and not cycling as it should.
Now with all that said. I opened thermostat door, left it opened all day... once the sun was no longer on that wall I had consistent readings like my earlier photos. Sounds crazy right... not really.
You see the bedroom sensor is in a perfect location and doesn't have to deal with any variations in temperature other than actual room temp itself. Now that I'm aware of this I will leave the door open to help prevent heat buildup or relocate sensor.
Both front and rear units are putting out a consistent 20-23° in compressor mode. At one point I got an 18°...
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-06-2016, 06:30 PM
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#19
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Senior Member
Join Date: Dec 2012
Location: Tennessee
Posts: 859
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Opps forgot to insert picture
__________________
Slim, RVing 30 plus years
2015 Dynamax DX3 37 RB
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04-06-2016, 11:36 PM
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#20
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Senior Member
Join Date: Jan 2015
Location: West Michigan
Posts: 641
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Glad to hear that you were able to figure out that the sun was causing the temp problem. Thanks for letting us know what you found.
Tim
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