I’ve replaced the IM 2 times and the motor module once. Freezer is normal after, for apprx. 4 – 8 mos., until customer again finds the freezer with “false frost” all over it(in the front, the back, top and bottom, the IM). It is almost everywhere! Problem does not appear to be air infiltration or evaporator not defrosting. Problem appears to be IM issue(as if IM has the heater staying on too long) Customer ready to replace refrig. Any service bulletins or suggestions on this? Thanks in advance for any help.

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Could possibly be a result of a bad evaporator. fan motor or defrost thermostat staying closed to long. Had an new fan motor, 120V this week that would on occasion run at a low speed and cause frost over everything in freezer and of course fresh foods warm. The lack of airflow will cause frost on all items in freezer. Frustrating, because one would “assume” that it could not be the new part creating a new problem! Also replaced a brand new faulty WP ice maker this week that never harvested the ice after mold was filled with water, so WP has been a sore spot for me, cost me especially with the fan motor issue because of the problem being so erratic. Could also be drain tube water evaporating out and outside humid air migrating in.same thing can happen with a toilet when left for long time, water evaporates, leaving an open pipe..
My friend use to put oil on top of the water to stop the evaporation.
Try small amount of cooking oil in drain to stop evaporation if the drain has a trap built in..
Here are some ice maker video suggestions . https://www.appliancevideo.com/?cat=&s=ice+maker+no+ice&post_type%5B%5D=post&post_type%5B%5D=premiumvideos&post_type%5B%5D=fromthefield&post_type%5B%5D=embdvideo

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