Error code reference

Sub-Zero Refrigerator Error Code 23

Defrost overheat with no voltage feedback through Gray/White wire at defrost start.

SourceSub-Zero UC-24 Refrigerator - Service Manualp. 3-20, 8-2, 8-4

Sub-Zero codes Sub-Zero refrigerator codes

Diagnostic procedure

The full 23 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

With cold evaporator (<10°F), initiate Manual Defrost. If compressor starts 5 minutes (10 minutes in 700TF/I-2V) after defrost is initiated, check Grey/White wire connections and continuity from defrost heater to J2-3 on control board. Reconnect/repair.

SourceRefrigerator - Service Manual: Troubleshooting Guides (700-3 BASE Series)p. 8-2, 8-4

Unlock with pass

More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

Unlock 23 procedure $9.95

Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.

Where this code is documented

25 manuals in the MyPros+ library document this code for Sub-Zero refrigerator.

Models covered by the manuals that document this code

More models are covered than are listed here.

75,000+ service documents · 20,000+ error codes · 100+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax

The full 23 procedure

Where this code is documented

Models covered by the manuals that document this code

Related Sub-Zero refrigerator error codes