Frigidaire · Microwave Serious

SE — Stuck key / Shorted membrane

SE (Sensor Error or Stuck-key Error) means the control board sees a keypad button signal continuously, as if a key is being held down. Often caused by a failed keypad/membrane switch or moisture/grease intrusion.

Keep using it?
Limited use only
DIY difficulty
Moderate
Verified against
frigidaire.com ↗

How to fix it

  1. Unplug the microwave (or trip the breaker) for 5 minutes to clear the control.
  2. Plug back in — if SE returns immediately with no input, it is not a stuck button you pressed.
  3. Remove the control panel per the tech sheet and disconnect the keypad ribbon from the board.
  4. Power on briefly — if SE clears with the keypad unplugged, the keypad is the failed part.
  5. Reseat the ribbon if intermittent; replace the touchpad/keypad assembly if SE returns.
  6. If SE persists with keypad disconnected, replace the electronic control board.

Why it happens

Typical signs: SE flashes on display · Microwave beeps repeatedly · Buttons unresponsive or one button triggers wrong function · Unit will not start a cycle

  • Faulty keypad / membrane touch panel Cracked or moisture-damaged ribbon under the touchpad shorts a key trace.
  • Loose or corroded ribbon cable Ribbon between keypad and control board not fully seated, or oxidized contacts.
  • Failed electronic control board Less common — board misreads inputs even with keypad disconnected.
  • Moisture or grease behind control panel Over-the-range units near cooktop steam can short the keypad.

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.

  • Frigidaire microwave touchpad / keypad Common replacement
    Amazon →
  • Frigidaire microwave control board Common replacement
    Amazon →

More Frigidaire microwave codes

Child Lock 'Lock' / 'L' — Child lock engaged Cooling Fan 'Cooling Fan' / Fan-runs-after-cooking — Vent fan stuck on Demo 'Demo' / 'd' — Showroom demo mode on door 'door' message — Door not fully closed F2 F2 — Keypad / Control Board Input Fault F3 F3 — Stuck key on touchpad

All Frigidaire codes → All microwave codes →

Frequently asked questions

What does the SE code mean on a Frigidaire microwave?

SE (Sensor Error or Stuck-key Error) means the control board sees a keypad button signal continuously, as if a key is being held down. Often caused by a failed keypad/membrane switch or moisture/grease intrusion.

What causes the SE code on a Frigidaire microwave?

Faulty keypad / membrane touch panel: Cracked or moisture-damaged ribbon under the touchpad shorts a key trace. Loose or corroded ribbon cable: Ribbon between keypad and control board not fully seated, or oxidized contacts. Failed electronic control board: Less common — board misreads inputs even with keypad disconnected.

Is it safe to keep using a Frigidaire microwave with a SE error?

Limited use only. This is rated a serious-severity fault.

How do I fix SE on a Frigidaire microwave?

Unplug the microwave (or trip the breaker) for 5 minutes to clear the control. Plug back in — if SE returns immediately with no input, it is not a stuck button you pressed. Remove the control panel per the tech sheet and disconnect the keypad ribbon from the board.

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: frigidaire.com.