Advent Air error code dF

[Yow]

We are in So Tx & the ambient temperature is 100?.  Our AC has an error code of dF.  I promise you the unit is NOT frozen.  What do i need to do to get my AC up & going again in this heat?

 

[youracman]

We are in So Tx & the ambient temperature is 100?.  Our AC has an error code of dF.  I promise you the unit is NOT frozen.  What do i need to do to get my AC up & going again in this heat?

This is a rather cryptic post to respond to; but a couple of thoughts:

The way your post is written, I take it that the error code dF means "Defrost Req'd" or something similar (I don't own an "Advent Air" BTW, but all the RV rooftop units are basically just "Window Units" at their core.)

There is a freeze sensor that is designed to shut your AC down before the whole evaporator coil freezes up.  It may be that that sensor is defective and "thinks" it is feeling ice (or maybe it actually is.)  Where did you look to satisfy yourself that the unit is NOT frozen?  The sensor is "usually" located between the second and third row of tubing counting from the bottom of the evaporator and is usually about 4 to 6 inches from the edge.  If you are ever gonna see an "authorized" shut down due to icing it would be in So Texas or anywhere along the Gulf Coast where monster humidity is present.  Even so, it most often occurs due to decreased/inadequate  air flow (AKA dirty filter ...... most of the time) but can be a blower problem, duct problem, etc.  (Low refrigerant can cause icing too, but your system is sealed and refrigerant loss is "almost" unheard of.) If the sensor is not defective and really IS seeing ice forming, the unit should restart once the ice has melted (perhaps you will need to turn your stat off for a few seconds and back on to reboot ...... dunno.)

I did read where the thermostat for one particular model of Advent Air had 11 wires going to it.  That would lead me to believe that the stat is doing a lot more than just cycling the unit as req'd and, maybe the complexity equates to a higher failure rate than some systems.  BTW-  Their tech support number is: 800-688-3135 (option #3) .......... but it is apparently a Mon-Fri operation.

Wish I could be of more help but you are about 1400 miles away, unfortunately.  I have read where most mobile technicians are pretty savvy on rooftop A/Cs.  May be time to call one out; park owners usually know which ones are good.  I'd probably survive best I could on the coach's dash air until help arrives.

Sorry for your troubles.  Wish I could be of more help.  Hopefully someone on the forum has seen your problem first hand and can give you some advice based on their "real world" experience.  Way better'n guessing.

Ed S .... in nice and dry Denver.......formerly from Houston.

 

[Gary RV_Wizard]

How can you be so sure the unit has not iced up?  Ice/freeze up is fairly common in hot, humid weather or when air flow through the a/c heat exchanger is limited.  You probably can't see actual ice on the external fins - the sensor will shut it down before it gets that bad.
youracman covered it well; heed his advice.