Forced Defrost Mode - Fisher & Paykel RX256DT4X1 FP Service Manual

8.3.2

Forced Defrost Mode

A manual method to force defrosts for use in testing and production is provided. This mode can be used
to force an immediate defrost followed by either a short period (8 - 12 hours) or a long period (> 72 hours) to
the next defrost.
Entering Forced Defrost Mode.
The forced defrost function is performed using the refrigerator display and keypad. Enter the Forced
Defrost Mode by performing the following sequence of events:
• Hold the refrigerator door light switch closed.
• Press the Refrigerator Temperature Down keypad
NOTE: The 3 keystrokes must be consecutive and within 10 seconds.
• Release the refrigerator door light switch.
• The control will display Fd to confirm entry into the Forced Defrost Mode.
• Entry is confirmed by pressing the Refrigerator Temperature Down keypad
unit is off and in the Defrost Mode.
NOTE: All control functions will be turned off (compressor, defrost, evaporator fan, and the
damper will remain in its current position).
• The control will default to the short run period test as shown here.
NOTE: It is possible to toggle between the (S)hort and (L)ong test mode by pressing the
Refrigerator Temperature Up keypad
and should not be used in the field.
• Once the desired mode is displayed, confirm the forced defrost by pressing the
Refrigerator Temperature Down keypad once. The display will return to a normal operating
display with set point values.
The Forced Defrost mode can be exited at any time by closing the refrigerator door(s).
3 times consecutively.
. The Long Test mode is for engineering use
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once more. The