Evaporator Thermistor; Thermistor Failure - Viking VCWD630-SG41A User Manual & Service Manual

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Table of Contents

USER GUIDE

Thermistor

USER GUIDE

Thermistors are used for various temperature readings.

Thermistors provide reliable temperature readings

using a resistance which varies based on surrounding

Thermistor

temperatures. If a faulty thermistor is suspected it may be

tested using an accurate ohmmeter.

Thermistors are used for various temperature readings.

Thermistors provide reliable temperature readings using a

All the thermistors in the unit are identical. If a thermistor

resistance which varies based on surrounding temperatures. If a

is suspected of being defective, the resistance can be

faulty thermistor is suspected, it may be tested using an

verified. Place the thermistor in an ice water bath, the

accurate ohmmeter.

resistance should read 16.1k Ohms +/-5% on your meter.

Thermistor connections must be kept clean. A thermistor

connection that has become corroded can cause resistance

values from the thermistor to change as they pass through a

values from the thermistor to change as they pass through

dirty connection to the board.

a dirty connection to the board.

It is for that reason that we apply dielectric grease to all of our

It is for that reason that we apply dielectric grease to all of

thermistor connections. Dielectric grease will help to keep

our thermistor connections. Dielectric grease will help to

thermistor connections clean and dry.

keep thermistor connections clean and dry.

If you change a thermistor in the unit, please re-apply dielectric

If you change a thermistor in the unit please re-apply

grease to the connection. If you encounter a dirty thermistor

dielectric grease to the connection. If you encounter

connection, you should replace the thermistor and the

a dirty thermistor connection, you should replace the

thermistor harness.

thermistor and the thermistor harness.

This unit has one thermistor located along the right hand

sidewall of the ice bin. It is used to maintain the ice level in the

Thermistor error information can be found in the Control

bin.

Operation - Service section.

This unit has four thermistors.

Thermistor One (Top Zone):

Located along the side wall in the upper zone. It is used to

maintain the operating temperature within that zone.

Thermistor Two (Top Evaporator)

Located on the top evaporator - used for defrost.

Thermistor Three (Bottom Zone):

Located along the side wall in the bottom zone. It is used

to maintain the operating temperature within that zone.

Thermistor Four (Bottom Evaporator)

Located on the bottom evaporator - used for defrost.

THERMISTOR FAILURE

Zone Thermistor

If a zone thermistor in the unit fails, the unit will continue

to cool in a backup mode (Self Preservation Mode) to

preserve the integrity of the contents. The unit will

otherwise operate normally.

Thermistor