You have a bad defrost timer. Your old timer is probably a 21 minute defrost and 8 hour compressor run time. I would replace it with a GE timer p# 9x330 a much more reliable timer.Or you can go with a universal timer (electronic) P # EDT10
Per my catalog they all look the same and should mount in there, the electrical connections should be at the same places as the old one, but I usually verify with an ohms check.
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