Whirlpool Microwave F9 E0 Error Code: Appliance Not Wired Correctly

What the code means

Whirlpool's Product Help article for F9 or F9E0 on built-in microwaves says the code most often means the appliance is wired incorrectly at the home electrical supply or at the hardwire connection, and that a newly installed unit should have its supply checked by a qualified electrician. It adds two less serious triggers: power-line noise during an outage that the control read as an incorrect voltage, and keys pressed before the 10-second delay on power-up. Whirlpool's cooking error-code chart gives the same meaning and singles out installs within about the last three months. Whirlpool's Smart Wall Oven service manual W11174422 names F9E0 Product not wired correctly: cycle power, confirm the code in Error Diagnostics, then with power off check the house wiring to the product to see if the neutral is switched with L1 or L2, and verify L1 to L2 is 240 V and each leg to neutral is 120 V. Whirlpool's range tech manual W11202275 calls F9E0 Power Input, product is mis-wired. This is different from F6 E8 (lost communication with the microwave control) and from F6 or F7 on over-the-range microwaves.

Likely causes

• The neutral swapped with one of the hot legs (L1 or L2) at the house supply or the appliance's hardwire connection, the miswiring Whirlpool's service manual has the installer check first
• A new or recent installation that was wired incorrectly, which Whirlpool says is the most common reason for this code
• Electrical noise on the power line during an outage or surge that the control read as an incorrect voltage
• Keys pressed before the 10-second delay when power comes back on, which Whirlpool says can make F9 E0 appear
• Incorrect supply voltage to the unit, where Whirlpool expects 240 V between L1 and L2 and 120 V from each leg to neutral

Safe DIY checks

1. Turn off the circuit breaker(s) for the unit for one full minute, turn them back on, and don't touch any keys for at least 10 seconds. Then watch the display for a minute. This is Whirlpool's own first step.
2. If F9 E0 showed up right after a power outage or surge and the reset clears it, use the oven normally and see if it stays away.
3. If the unit was installed or rewired recently, or F9 E0 keeps coming back, stop using it and have a qualified electrician check the supply and the hardwire connection against the installation instructions.
4. When you call for help, mention that Whirlpool's service manual says to check for the neutral switched with L1 or L2 and for 240 V across L1 and L2 with 120 V from each leg to neutral.

Parts that commonly fix it

Always match the part number to your exact model.

Related codes

• F1E4 Whirlpool Microwave F1E4
• F6 Whirlpool Microwave F6
• F6 E8 Whirlpool Microwave F6 E8
• F7 Whirlpool Microwave F7
• E-11 Frigidaire Microwave E-11

All Whirlpool codes →

Sources

1. Whirlpool Product Help: F9 or F9E0 - Built-In Microwave (wired incorrectly at the home supply or hardwire connection; power-line noise; keys pressed before the 10-second delay; one-minute breaker reset)
2. Whirlpool Product Help: Error Codes for Cooking Appliances (F9 or F9 E0 miswired outlet or connection, recent installs within about 3 months)
3. Whirlpool Service Manual W11174422, Smart Wall Ovens (F9E0 product not wired correctly: neutral switched with L1 or L2, 240 V L1-L2, 120 V each leg to neutral)
4. Whirlpool Tech Manual W11202275 Rev B (F9E0 Power Input, product is mis-wired)