Error code reference

Sub-Zero Freezer Error Code 40

Excessive freezer compressor run (compressor ran 100% for 6 hours continuously).

SourceSub-Zero 600-3 Series Freezer - Full Service Manualp. 3-21

Diagnostic procedure

The full 40 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

If Error Code 07, 20, 21, 22, 23, or 24 is also displayed during Diagnostic Mode, see Test/Actions under that code. Check for obstructions to freezer door/drawer closing. Check cleanliness of condenser.

SourceSub-Zero 600-3 Series Freezer - Full Service Manualp. 3-21

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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

8 manuals in the MyPros+ library document this code for Sub-Zero freezer.

Models covered by the manuals that document this code

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The full 40 procedure

Where this code is documented

Models covered by the manuals that document this code

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