SE Serious Moderate DIY

Frigidaire Microwave SE — Stuck key / Shorted membrane

Frigidaire Microwave · Error code SE

What SE Means

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.

Symptoms

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

Common Causes

1
Faulty keypad / membrane touch panel

Cracked or moisture-damaged ribbon under the touchpad shorts a key trace.

2
Loose or corroded ribbon cable

Ribbon between keypad and control board not fully seated, or oxidized contacts.

3
Failed electronic control board

Less common — board misreads inputs even with keypad disconnected.

4
Moisture or grease behind control panel

Over-the-range units near cooktop steam can short the keypad.

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.

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.

Common replacement Frigidaire microwave touchpad / keypad View on Amazon→ Common replacement Frigidaire microwave control board View on 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 F1 F1 — Control board / thermistor open F10 F10 — Analog-to-digital / keypad communication error

All Frigidaire codes → All microwave codes →

Verified against manufacturer documentation: frigidaire.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.