What F4E9 Means
F4E9 is published as a possible problem with the Smart Pop control or the associated wiring. Smart Pop is the sensor-driven popcorn function, which listens to the moisture coming off the bag rather than running a fixed time.
Common Causes of F4E9
- Transient fault cleared by a reset
- Sensor fouled by cooking residue
- Control wiring connector loose
- Smart Pop control or its sensor failed
🔧 One Safe Check You Can Try
Switch the microwave off at its circuit breaker for one minute, restore power, then run a short heating test with a cup of water to verify operation, which is the check Maytag asks for. Then use manual time and power for popcorn in the meantime, following the instructions on the bag and staying with the microwave while it runs - popcorn scorches quickly once the popping slows, which is exactly what the sensor function exists to prevent. Test general heating with a cup of water to confirm the rest of the appliance is unaffected.
⚠ Why You Shouldn't Go Further Than That
- A microwave oven holds a high voltage capacitor that can retain a dangerous charge long after the appliance is unplugged, so the cabinet is never opened at home under any circumstances.
- An over-the-range unit is mounted above a cooking surface at head height and is heavy enough to need two people and a support to remove safely.
- Never leave popcorn unattended when cooking it on a manual time, since scorched popcorn can smoke heavily.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.