I think I need to replace the thermistor ZISS480NRGSS

Hi,

please increase the temperature in the fridge portion of your fridge as it sounds like you've set that compartments temperature too low.

Thank you.

try running with thermistor unplugged

bad timer or circulation fan

Even though the freezer thermistor passes the test, it's bad. The test only sees if the thermistor is open circuit or grounded. These thermistors can send bad information to board. Replace the freezer thermistor and I think that will solve your issue. Good Luck

A thermistor is a component whose
resistance changes when its temperature changes.
A thermistor is a special type of resistor whose
resistance decreases as its temperature increases.

A plot of resistance against temperature for
a thermistor is shown above. The plot is unusual
because it shows that a bigger current will flow
at a higher temperature. For most components, the
resistance increases as the temperature increases
and a smaller current flows at a higher temperature.
>
What is a Thermistor used for?
A thermistor can be used in a circuit to detect a
temperature change. For example, a thermistor may
be used to keep a freezer at the right temperature.
A circuit with a thermistor in it can switch the freezer on if the temperature gets too high and switch the freezer
off again when the correct low temperature is reached.
A thermistor can also be used to trigger a fire alarm. Thermistor are used in all Temperature controlled device and Motors to cut off
circuit when temperature rises over a certain limit to cut off power or trigger another circuit.

Try this first:

Self Diagnostics

To enter Self Diagnostic mode, both temperature control panel displays must be illuminated. A display can be illuminated by pressing an adjacent temperature adjustment button. When both displays are illuminated, set the freezer and refrigerator temperature settings to 5. Simultaneously press and hold all

4 temperature adjustment buttons for approximately 3 seconds. A flashing 0 in the refrigerator and freezer displays will indicate that the refrigerator is in Self Diagnostic mode.

For temperature control panels with single-digit displays, the COLDER temperature adjustment button will increment the numbers up and the WARMER temperature adjustment button will increment the numbers down. Use the freezer temperature adjustment buttons to enter the test code number in the freezer display. Use the refrigerator temperature adjustment buttons to enter the test code number in the refrigerator display. When a test code has been entered, the displays will flash to confirm the test. Press the HOLD button for 3 seconds to begin the test.

For temperature control panels with 3-digit displays, the COLDER temperature adjustment button will increment the numbers down and the WARMER temperature adjustment button will increment the numbers up. Use the freezer temperature adjustment buttons to enter the test code number in the freezer display. Use the refrigerator temperature adjustment buttons to enter the test code number in

the refrigerator display. When a test code has been entered, the displays will flash to confirm the test

code. Press any button other than a temperature adjust button to begin the test.

When testing has been completed, do one of the following things:

• Enter code 1 5 to completely reset the system.

• Enter code 1 6 to exit diagnostic mode. The temperature control panel is reset automatically.

• Unplug the refrigerator for at least 10 seconds. Test mode will terminate when the refrigerator is plugged back in.
Test mode will terminate automatically after 15 minutes of inactivity.

You need to cycle your freezer display to indicate 0 and your refrigerator display to 7.

Control and Sensor System Self-Test (0 7)

This test checks all five thermistors located throughout the unit. Once the test is initiated, the test code (0 7) will stop flashing and the thermistor test results will appear on the freezer display in the test order listed below. The thermistor test sequence number will not be shown on the display.

If the unit is not equipped with the Quick Chill option, the third thermistor (quick chill) will display a 0 and 3 audible beeps will sound at the temperature control panel. This is not a failure if the unit is not equipped with the Quick Chill option.

Thermistor test results:

• P = Pass

• 0 = Failed

• S = Short to 5 VDC

• B = Bad amplifier

Thermistor test sequence is:

1. Fresh food top thermistor

2. Fresh food bottom thermistor

3. Quick chill thermistor (displays 0 if unit is not equipped with Quick Chill option)

4. Evaporator thermistor

5. Freezer thermistor

Note: Thermistor test results will be displayed in the sequence shown above. The thermistor test sequence number will not be shown on the display.

Note the failures if any. Should ANY of thermistors fail you must replace it.

Having said that... at this point your stick with doing a manual defrost by unplugging the unit and directing a fan into the compartment for just over 2 hours to make sure ALL of the ice on the coils and in the drains has melted. (Yes it makes a water mess!)

After the manual defrost restart the unit / plug it in and once the compressor starts listen for the evaporator fan when the door switch is actuated and the condenser fan in the bottom of the unit any time the compressor is running. If either of the fans are not running you must find out why. Can be a door switch, motor winding or power to the motor. The door switch does not affect the condenser fan.

Finally if the unit is not automatically defrosting due to a component failure... i.e

Heater, themistor, or wiring you will see ice build up again in 2 to 3 days again and you will have to keep going through the manual defrosting routine until the automatic defrosting problem is resolved.

Thanks for choosing FixYa.

Kelly

clean the coils on the back of the fridge and make sure the condenser fan is free and running normally. that is the fan at the back of the unit on the bottom where the compressor is. if it cant ge rid of the heat, it wont cool. also make sure the the fan that supplys the cold from the freezer to the fridge is working.

Hello. You need a new cabinet thermistor and while you are at it replace the evaporator thermistor. (The evaporator is the cooling coil behind the back wall of your fresh food section) . These sense the temperature in your frig. Both of them are behind the back wall of your fresh food compartment. You will need a wire crimper and a heat gun or lighter to heat shrink the wire connectors that come with the new ones.