Skip to main contentStart diagnosing 21 on your Whirlpool oven
What this code means
Oven sensor opened (lower oven).
First step from the service manual
Unplug range, disconnect sensor from harness, measure sensor resistance between connector pins (approx. 1080 ohms at room temperature).
Next steps: diagnose the root cause
1
Verify the error code is active
Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.
2
Get the full diagnostic procedure
Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.
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What’s available for Whirlpool oven models
Access Whirlpool oven service manuals, wiring schematics, exploded parts views, and error code references on MyPros+.