Holding the temperature Part 3 of 5 in this group
The Evaporator Fan in a Wine Unit
The small fan that drives cabinet air across a zone's cold coil and back past the bottles.
Of the moving parts inside a wine cooler, the evaporator fan is the one you are most likely to hear. Every part for an island job crosses I-90 with us, so this is a motor we would rather carry on the first visit than order after it.
What a failing fan does to the zones
A wine cabinet has more than one fan, and a warm zone can come down to any of them. When the fan serving a zone stops, the result is lopsided: that zone climbs, the other stays put, and the compressor runs longer trying to satisfy the warm side. A sensor that has drifted can look much the same, which is why the note on zones drifting apart sorts one warm zone from two before anything else.
Three ways it goes
The bearings wear, and a faint tick or whine from inside the cabinet grows over weeks. The motor stops outright, and a zone that used to hum goes quiet and warm. Or ice does it: frost that grows on the zone evaporator from air let in at the door reaches the blades until they catch or freeze in place. The third is the one damp island air invites, and replacing the motor without dealing with the door that let the water in only resets the clock.
What to listen for
With the door shut and the unit running, stand close and listen for a steady rush of air. A new rattle, a squeal, or silence from a zone that is running warm is worth a call. Leave the covers inside the cabinet in place; the fan is powered, and getting to it is our side of the job. A motor that has failed is replaced with a genuine part as a wine storage repair, with the price agreed before it is fitted.