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Revision Date – 15/07/2020 page 31

TEST PASS

If the measured resistance is within ± 5k Ω of the tabulated value, the thermistor is functioning

correctly.

TEST FAIL

If the measured resistance varies greatly from the tabulated value or an open circuit is detected, the

thermistor is faulty and should be replaced (refer to section 9.10).

8.5 Adjust internal temperature correlation

Purpose: To adjust the internal temperature calibration so that the display temperature matches the

temperature at the base of the fridge.

This adjustment should only be necessary if the thermistor has been replaced.

NOTE : A display temperature within 2-3°C (3.6-5.4°F) of the actual temperature at the base

of the fridge is within normal on/off cycle temperature variation. If this is the case,

the internal temperature calibration should not be changed.

Procedure:

 Connect the fridge to 12/24V DC or 100-240V AC.

 Turn the fridge on.

 Press and hold and simultaneously until “A 0” appears on the display.

 Push or to adjust the setting.

 Continue pressing or until the desired adjustment is made.

 After 5 to 6 seconds of inactivity, the display will flash twice and return to displaying the current

target temperature.

 Allow the fridge to cycle on and off a few times to allow for any temperature lag.

 Check the temperature display against the temperature at the base of the cabinet.

CALIBRATION SUCCESSFUL

If the temperature display is within 2-3 °C (3.6-5.4°F) of the temperature at the base of the fridge,

return the unit to the customer and advise that this is within normal on/off cycle temperature variation.

REPEAT CALIBRATION

If the temperature display is not within 2-3 °C (3.6-5.4°F) of the temperature at the base of the fridge,

repeat the calibration procedure above.

Zero ARB Service Manual

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