Hey all,
This is my first post, so please let me know if i'm doing this in the correct area.

Looking at a Master Bilt MBGFP48 freezer that the evap was a solid block of ice. Not frost, BLOCK OF ICE!!! When thawed out it filled a 5 gallon bucket.

The bi-metal checked out ok, cut circuit at about 80 degrees F.
Heat element tested at 15 ohms.
Both evaporator fans are OK.
Drain is clear.
Door seals are perfect.
Defrost schedule is every 6 hours.

When I let unit come down to temp @ -5 F, I actvated manual defrost. The defrost mode came on for about 2 minutes then went into recovery mode. In the 2 minutes in the defrost mode the heater element had 7amps showing. I also put a temperature probe on the heat element, but it did not show any noticable rise in temp.
I'm thinking the controller might be defective since new. This unit was installed about 2 months ago, maybe it never correctly defrosted since then.
I ran the electrical for it, used 10AWG for 60' run and 20AMP 120V circuit. The delivery people turned unit on when it was delivered.

Any advise or help????? Thanks