Error code reference

Sub-Zero Freezer Error Code 91

Primary on accent LED power supply failure; both bulbs must be burned out on drawers to trigger error. 91 1 00 = Door/drawers left, 91 3 00 = Door right, 91 4 00 = Drawers right.

SourceSub-Zero 648PRO Freezer - Service Manualp. 8-5

Sub-Zero codes Sub-Zero freezer codes

Diagnostic procedure

The full 91 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

Check accent LED power supply and drawer light bulbs.

SourceSub-Zero 648PRO Freezer - Service Manualp. 8-5

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More steps, wiring diagram references, and verified part numbers

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

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Where this code is documented

1 manual in the MyPros+ library documents this code for Sub-Zero freezer.

Models covered by the manuals that document this code

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The full 91 procedure

Where this code is documented

Models covered by the manuals that document this code

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