I have a beverage air kegerator that seems to work fine, but the evaporator fan runs constantly. Is it supposed to run constantly, or is it supposed to cycle on and off with the compressor, etc.?

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The fan is supposed to run constantly and they do get noisy. Take it out and go to grainger or a refrigeration supply house and they will match it up with a replacement. Its a very common part. Good luck and hope this helps.

yes sounds like a bad defrost terminator or timer?
not allowing it to go into defrost so compressor runs all the time and it frreezes up

its plugged, try a piece of say 16 gauge copper wire or a piece of weed wacker trimmer line(best) to snake it out

http://beverage-air.com/pdf/manualsbycategory/K%20Series%20-%20Bottom%20Mount%20Reach-Ins/CFG_CRG_KF_Series809-046A.pdf

The fan has a limit control wired in series that shuts the fan down until the coil temperature reaches 25*F. this prevents the fan from blowing warm around after defrost.
There is also a switch which is placed for the door to close. Either one may be defective.
Worst case is the freezer is not pulling down temperature wise.

I would definately start there. That is what contols the cycling of the compressor.

It sounds like you have a bad fan motor. Call a service company out. They should be able to fix it. :)

It can take a very long time to get a keg of beer down in temperature. The heat transfer from a keg is slow due to the lack of air circulation inside the keg. You should also check your condenser coils, make sure they are clean. Door gasket should also be in good repair. Hope this helps.

The fan inside the unit should run all the time, this insures a more constant temp throughout the compartment by keeping the air moving.

Its normal