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Ice buildup is most often caused by low freon. Is the unit 10 years old or more? Might need a recharge. Turn it off and let it thaw then back on. If it ices up again, it likely needs a recharge.
The gas can pass through the pipework slowly by osmosis especially after several years use. However, check fans, heat exchangers etc first before condemning unit.
Turn the unit OFF and unplug it from the wall. Allow it to thoroughly thaw and remove the humidifiers cabinet to expose the cooling coils. Clean those thoroughly and coat with a very light coating of WD40. Reassemble the humidifier and turn it ON. Set your humidity control at 50% and allow the unit to run for at least one hour. Check for water collection in the bucket and for any signs of icing, after one hour. If water is in the collection bucket and no signs of icing, lower the humidity to 45% and continue. If you not any signs of icing, watch the unit, as you need to know if it automatically goes into defrost mode. The compressor should shut off, but the fan will continue to run until defrosting is completed. If it doesn't the auto defrost sensor has failed and will need to be replaced. \ Hope this helps you to troubleshoot and solve the problem. Please let me know. Thanks.
Your post says you have an RX but the picture shows a SantaFe Classic.
In either case the massive frost build up is caused by a defective defrost thermostat. PN 4021470 Parts Dept 800-533-7533 x 8451
The defrost thermostat has an internal set of electrical contacts that are designed to open up and turn the compressor off when frost or ice has accumulated on the tubing and the evaporator coil. If the contacts fail to open, the compressor keeps running and the frost and ice just keep accumulating until such time as the homeowner unplugs the unit or a sevice tech replaces the defrost t-stat.
Dwaine
Thermastor Service Dept
800-533-7533 x 8459
Depending on the location of the icing up unit, it may be in an area of your basement that's a bit too cool. These units are notorious for icing up under such conditions.
First, "defrost" the iced up unit completely using a hair dryer. Then swap its location with the other unit which is functioning normally. If that resolves the problem, then it was caused by the above "too cool" scenario.
If not, then it's likely that the thermal control which periodically heats up the coils in order to melt off the accumulated frost/ice and drain it has failed. Repair could be costly, and you're probably better off replacing the unit with a new one - - which you can find for less than $200.
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