Hello;
My name is peter. I am a retired field service refrigeration technician.
"Of" means you are locked into the defrost mode. This is where your unit will shut down every 8-10 hours. Everything will stop running except for the light. The defrost mode take about 20-30 minutes where the heater turns on and defrost the cooling coil, then the unit turns back on.
Some upright freezer have a separate defrost timer, but not yours.
Your defrost timer is built into your control board.
PART NUMBER:
297366300 - Cost: $70.00
If you go into the internet you may be able to get the board for $40.00.
Install:
1.) Unplug your unit.
2.) Ground your self by touching bare metal. Static electricity will knock out a board.
3.) With a small flat head screw driver, wedge the outer frame and pop the assembly out. You only have one connector to disconnect. You may need the small screw driver to free the connector.
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