Thermistors; Thermistor Failure; Reed Switch - U-Line U-3018RFOL-00 Service Manual
Modular 3000 series
120v, 3018/3024 models
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- Service manual (40 pages) ,
- Use and care manual (24 pages) ,
- Use & care manual (24 pages)
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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 (32°F) resistance should measure 16.1 kilohms,
16.1K Ohms - 32°F ambient
Thermistor Failure
Zone Thermistor
If the zone thermistor 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 error will be displayed on
the main display, "Self Test" and logged in "All Errors".
Evaporator Thermistor
If the evaporator thermistor fails, the unit will rely on a preset
defrost timer during defrost cycles. The unit will otherwise
operate normally. Evaporator thermistor errors are hidden from
the display and recorded in "All Errors" and displayed in "Self
Test" modes.
Ambient Thermistor
The ambient thermistor is mainly used for diagnostics. If the
thermistor fails, the unit will operate normally.
Reed Switch
A reed switch is used to monitor door state. The switch side is
mounted under the cabinet and the magnet is mounted to the cable
arm. 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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Troubleshooting
Magnet Close To Switch
(Door Closed)
(Switch Closed)
31
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Troubleshooting
