Interface Board (Lcd Display); Tests; Initial Test Routine (Factory Routine) - Whirlpool WRX-17TM Service Manual

Silver color, electronic no frost refrigerator dual fan, maestro project, high range smile design

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4.6. Interface Board (LCD Display)

The Interface board has the function of interacting with the user, indicating the product functions/programming

and operation (see use characteristics item) always put in operation by the electronic control.

Two automatic test routines are available in these refrigerators in order to prove the main components of the

product: one executed automatically by the software of the electronic control, when the product is plugged on

the power supply and other handled by the own technician, which are described as follows:

This refrigerator has an Automatic Testx Routine (works automatically, without manual operation) that is always

executed when the product is energized to the power supply, in order to verify the functioning of the main

components of the product. This routine operates as follow:

# Turn off the product from the wall socket, wait 10 seconds and turn it on again.

Note: At this moment, an inner temperature check will occur in the evaporator, through the Defrost Sensor, and

then the Routine will start automatically.

The Defrost Heater is energized for 6 seconds

Freezer Fan Motor is energized for 6 seconds

Refrigerator Fan Motor is energized for 6 seconds

After 18 seconds, from the result (temperature) gained from the Defrost Sensor, the Electronic Control will

manage the activation of the compressor and fan motors, as follow:

# If the Defrost Sensor is warm (temperature > 0o C)

Compressor and fans will be energized / turned on.

# If the Defrost Sensor is cold (temperature < 0o C)

Compressor and fans will not be energized / (will keep off).

After 328 seconds (5.5 minutes) the product is energized, an automatic check will occur for all the Sensors

(Refrigerator, Freezer & Defrost)

# If any of the sensors present failure (open or in short circuit);

The Automatic Routine will be aborted (348 seconds/ 5.8 minutes); then, after 2 minutes (468

seconds/ 7.8 minutes) the Alarm Code will be shown on the display and the operation proceedings will

follow as described in item – Alarm System.

# In case of no failure is detected

Product will abort the Automatic Routine (348 seconds/ 5.8 minutes) and starts working in normal

activity, switching on the components due to the necessity (display temperature).

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