U-Line 2260ZWC User Manual page 56

USER GUIDE
SAFETY • INSTALLATION & INTEGRATION • OPERATING INSTRUCTIONS • MAINTENANCE •
THERMISTORS
Thermistors are used for various temperature readings.
Thermistors provide reliable temperature readings using a
resistance which varies based on surrounding
temperatures. If a faulty thermistor is suspected it may
be tested using an accurate ohmmeter. In an ice water
bath (32°F) resistance should measure 16.1 kilohms.
5K OHMS @ 77°
16.1K OHMS - 32°F ambient
THERMISTOR FAILURE
Zone Thermistor
If the zone thermistor fails, the unit will continue to
operate in a timed limp mode for 5 minutes on and 45
minutes off. The unit will otherwise operate normally. The
error will be displayed in the error log.
Evaporator Thermistor
If the evaporator thermistor fails, the unit will rely on a
preset defrost time during defrost cycles. The unit will
otherwise operate normally. Evaporator thermistor errors
will be displayed in the error log.
Always assure that all thermistor connections are clean
and dry. Whenever opening a thermistor connection be
sure to apply a fresh dab of die electric grease.
REED SWITCH
A reed switch is used to monitor door state. When the
door is closed magnetic force pulls the reed to its contact
and closes the circuit which turns the light and display off.
When the door is open the reed pulls away from the
contact and opens the circuit. If the door is left open for
longer than 5 minutes, the switch will trigger an error code
and set an audible warning.
Magnet Away From Switch
(Door Open)
(Switch Open)
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SERVICE
Magnet Close To Switch
(Door Closed)
(Switch Closed)
Troubleshooting - Extended 4