Error code reference

Sub-Zero Freezer Error Code 15

Sealed system fault: evaporator temperature cannot drop 5°F in 5 minutes across 3 consecutive valve activations.

SourceSub-Zero 400 Series Freezer - Service Manualp. 7-6, 7-7

Diagnostic procedure

The full 15 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

Initiate manual valve activation mode for upper compartment and check for proper voltage from J3 on board to evaporator fan motor; if opposite evaporator temperature drops, check valve wiring.

SourceSub-Zero 400 Series Freezer - Service Manualp. 7-6, 7-7

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More steps, wiring diagram references, and verified part numbers

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Where this code is documented

2 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 15 procedure

Where this code is documented

Models covered by the manuals that document this code

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