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first, check defrost timer function, then check heater functions. Is power making it to the heaters? Does the heater have continuity? How long, if at all, does it stay in defrost? Some unit have a defrost terminator, and, when it fails, it will go in and out of defrost instantly.,. Start there my friend.
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Be sure you have the defrost timer set for 4 defrost cycles and no less than 30 minutes each time.
Make sure doors close and seal tight.
Verify that the defrost heaters work.
Sit and time a defrost cycle. It could be terminating early, prior to the coil being completely cleared.
If it is frost on the coil, could be an air leak or high humidity.
If it is icing, it is a defrost problem.
Start here and let me know.
Having to manually defrost an automatic defrost system tells me there is a problem with your defrost timer. Most Beverage-air freezers have a Paragon timer. There are two dials on these timers. An inner and outer dial. On the inner dial is an arrow to indicate the direction of rotation as counter clock wise. On the inner dial is a copper pointer indicating duration of the defrost cycle.
Observe the copper pointer, no movement indicates that the timer is bad.