Model reference

Sub-Zero PRO48

Name: Sub-Zero PRO48
Brand: Sub-Zero

Freezer

5 documents35 error codes28 service modes

Available documentation

Service Manual

Technical Service Manual Pro-Series (Model 648PRO - AKA PRO48)120 pg
Covers this model
Technical Service Manual Pro-Series (Model 648PRO - AKA PRO48)120 pg
Covers this model
Pro-Series (Model 648PRO - AKA PRO48) Technical Service Manual120 pg
Covers this model

Wiring Diagram

Pro-Series (648PRO) Wiring Diagrams/Schematics4 pg
Covers this model

Training

Built In Series29 pg
Covers this model

MyPros+ Max

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M+ Max·Sub-Zero Freezer

01 on my Sub-Zero PRO48

M+

Zone X Cabinet Thermistor Failure

From Service Manual 921303, p.35:

1.Access service mode to confirm the active fault code and read stored error history.

2.Disconnect the sensor and measure resistance. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens. A reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part WP8577274

Temperature thermistor

Error codes (35)

CodeMeaning

01Zone X Cabinet Thermistor Failure (Device or Wiring).02Zone X Evaporator Thermistor Failure (Device or Wiring).03Zone X Condenser Thermistor Failure (Device or Wiring).04Ambient Thermistor Failure (Device or Wiring).20Check Zone X Defrost Bi-metal for Proper Operation.21Check Zone X Defrost Bi-metal for Proper Operation.22Check Zone X Defrost Wiring.23Check Zone X Defrost Wiring.24Check Zone X Defrost Heater Ohms.30Check for Stuck Icemaker or Water Valve Failure.35Check Zone X Fan, Fan Speed Error.40Zone X Excessive Compressor Run.41Check Zone X Compressor and Wiring.42Check Condenser Fan and/or Wiring.43Check Left Refrigerant Valve and Wiring.44Check Zone X Glass Door Heater and Wiring.45Errors Detectable with Red Door Switches 46Check Ice Accessory Wiring for Open Circuit.47Check Accent Lighting Wiring for Short Circuit.80Check Power to Compressor Controller for Zone X, Troubleshoot with Manual…83Replace Zone X Variable Speed Compressor and Filter-Drier.84Check Zone X Variable Speed Compressor Wiring.85Zone X Variable Speed Compressor Control Overheat.86Check Communication Wiring, Replace Zone X VS Controller.87Check for Broken Wiring or Open Defrost Heater.89Check Icemaker Solenoid Valve and Wiring.90Change Main Control Board.92Check Keypad Wiring.93Replace Keypad.94Check Wiring / Replace User Display #1 (Zone 1) or User Display #2 (Zone 3).

View all 35 error codes

94 (Zone 1)Check Wiring / Replace User Display #1 (Left/Freezer)94 (Zone 3)Check Wiring / Replace User Display #2 (Right/Refrigerator)96Datalogger Malfunction.97Check Communications Cables / Connectors.98Brownout

Service modes (28)

Diagnostics - Activate Zone1) Initiate Service Mode
Diagnostics - Clear Error History1) Initiate Service Mode
Diagnostics - Error History1) Initiate Service Mode
Diagnostics - Self Test1) Initiate Service Mode (hold COLDER, press POWER, release both)
Diagnostics - Statistics1) Initiate Service Mode
Diagnostics - Thermistor Read1) Initiate Service Mode
Diagnostics - Thermistors1) Initiate Service Mode
Manual Freezer Evaporator DefrostPress and hold the ICE MAKER key for 5 seconds.
Manual Zone Disable ModeWith unit ON, press and hold the WARMER key for the zone being disabled, then press the POWER key…
Model Information1) Initiate Service Mode
Operational Status - Ice Maker1) Initiate Service Mode
Operational Status - Zone Status1) Initiate Service Mode
Sabbath Mode1) Switch unit OFF using POWER key
Service ModePress and hold any COLDER key, then press the POWER key, then release both keys.
Service Mode - 1) Diagnostics - Activate Zone1
Service Mode - 1) Diagnostics - Error History (Clear)1
Service Mode - 1) Diagnostics - Error History (View)1
Service Mode - 1) Diagnostics - Self Test1
Service Mode - 1) Diagnostics - Statistics1
Service Mode - 1) Diagnostics - Thermistor Read1
Service Mode - 2) Operational Status - Ice Maker1
Service Mode - 2) Operational Status - Zone Status1
Service Mode - 3) Model Information1
Service Mode - 4) Version Information1
Service Mode (Main Entry)1
Showroom Mode1) Switch unit OFF using POWER key
Temperature Units Selection ModeWithin the first 1 minute after switching the unit ON, press and hold the ALARM key and the POWER…
Version Information1) Initiate Service Mode

Full entry steps, exit procedures, and test sequences are available in Max.

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