Defrost Operation; Entering Forced Defrost Mode - Viking RDDFF236 Service Manual

Diagnostics

Defrost operation

The Control Board adapts the compressor run time between defrosts to achieve optimum defrost intervals
by monitoring the length of time the defrost heater is on. After initial power up, defrost interval is 4 hours
compressor run time. Defrost occurs immediately after the 4 hours of compressor run time.

entering Forced Defrost Mode

Enter the Forced Defrost Mode by performing the following:
1. Press and hold the "DOOR ALARM" keypad.
Press and Hold
2. Then press and hold refrigerator temperature "–" (down) keypad. Both buttons are now being held in.
Hold Press and Hold
3. While still holding the refrigerator temperature "–" (down) keypad, release the door alarm keypad and wait
three seconds.
Release Hold
4. When entered successfully, Fd will be displayed in freezer display.
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