Thermistors; Thermistor Failure; Reed Switch; Air Flow - U-Line U-1115WCB-00 Service Manual

Thermistors

Type 2 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 ohm
meter. In ice water (32°F) resistance should measure 16.1 kilohms,
5K Ohms - 70°F ambient
16.1K Ohms - 32°F ambient

Thermistor Failure

Thermistor 1 (T1)
If thermistor 1 (T1) fails, the unit will continue to operate on a
preset time interval of 10 minutes on and 30 minutes off. The unit
will otherwise operate normally. The display will show "ER".

Reed Switch

A reed switch is mounted to the underside of each cabinet and a
magnet is mounted to the door. 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 its contact and opens the circuit. If the door or drawers are 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)
Magnet Close To Switch
(Door Closed)
(Switch Closed)
U-Line Service

Air Flow

NOTICE
The unit requires proper air flow to perform at its highest
efficiency. Do not block the front grille or internal fans at any
time, or the unit will not perform as expected. Do not install
the unit behind a door.
Troubleshooting
20