What causes the AccuPop Fail code on a Whirlpool microwave?

Wrong popcorn bag size for the cycle: AccuPop expects a standard bag — mini bags or jumbo bags can throw it off. Dirty / greasy AccuPop sensor: The sensor sits in the steam path and fouls over time. Failed AccuPop sensor: Same family as the humidity sensor; replace if cleaning doesn't help.

Whirlpool · Microwave Minor

AccuPop Fail — Popcorn Sensor Fault

The AccuPop popcorn sensor could not detect the popping pattern correctly. The unit aborts the AccuPop / Popcorn cycle but manual cook still works.

Keep using it?: Yes — fix when convenient
DIY difficulty: Easy
Verified against: producthelp.whirlpool.com ↗

How to fix it

Power down at the breaker for 1 minute.
Use a standard 3.0–3.5 oz microwave popcorn bag and place it flat in the center of the turntable.
Clean the cavity (especially the top vent area) and let it cool fully before retrying.
If AccuPop Fail returns on multiple cycles, replace the AccuPop / humidity sensor per the model's tech sheet.
Use manual time-cook for popcorn until the sensor is replaced.

Why it happens

Typical signs: 'AccuPop Fail' on the display · Popcorn cycle aborts early or burns · Manual time-cook still works

Wrong popcorn bag size for the cycle AccuPop expects a standard bag — mini bags or jumbo bags can throw it off.
Dirty / greasy AccuPop sensor The sensor sits in the steam path and fouls over time.
Failed AccuPop sensor Same family as the humidity sensor; replace if cleaning doesn't help.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Whirlpool microwave humidity / AccuPop sensor Common replacement
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More Whirlpool microwave codes

Demo Demo Mode — Not Heating Door Door / Open Door Closed — Safety Reminder F1E4 F1E4 — Appliance Manager or Power Relay Fault F1E5 F1E5 — Inverter Internal Fault F2 F2 — Keypad / Control Fault F2E1 F2E1 — Stuck Key / Keypad Fault

All Whirlpool codes → All microwave codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: producthelp.whirlpool.com.