Written by
Jordan Avery Appliance Repair Content SpecialistPublished August 17, 2026Technically reviewed August 19, 2026
Content status:
Verified
Error codeE-21
ApplianceMicrowave
Affected model seriesE30MH65GPSA, E30MH65GSSA
Quick answer
Electrolux microwave code E-21 indicates thermal sensor circuit is open.
Model compatibility: Electrolux reuses codes across series and control generations, so E-21 may mean something different on another appliance or platform. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
When E-21 appears on your Electrolux microwave, it indicates thermal sensor circuit is open. Model and control-platform context matters before any part is condemned. Use the observed symptoms and the full model number to confirm the correct diagnostic path.
The service meaning of this display is platform-dependent: thermal sensor circuit is open. Observed behavior such as heating or sensor operation may stop should be recorded because it helps distinguish sensor problem from sensor wiring issue.
This code set is documented for Electrolux over-the-range microwave models E30MH65GPSA and E30MH65GSSA. Do not apply these meanings to another microwave platform without model confirmation.
Signs
Symptoms you may notice
heating or sensor operation may stop
code may appear quickly after start
sensor-based modes may not run normally
Why it happens
Possible causes
sensor problem
sensor wiring issue
control-board problem
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Turn the microwave off and disconnect it from power.
Let the appliance cool completely.
Check only for blocked exterior vents.
Do not remove the cabinet to reach the sensor.
Important safety warning. Stop after one safe reset if the code returns.
Get help
When to call a technician
Sensor testing for E-21 is an internal microwave repair and should be handled by a trained technician.
A recurring E-21 is more useful to a technician when you also report whether heating or sensor operation may stop. The next diagnostic path can then verify sensor problem against the control-platform documentation.
Seeing this code on your Electrolux appliance?
If the code returns after the safe checks, book a repair visit and share the exact display plus your full model number.
Electrolux Microwave Repair for common Electrolux problems, safe troubleshooting, error-code context, and signs it is time to schedule professional service.
It indicates thermal sensor circuit is open. Confirm the full model number because Electrolux diagnostic meanings can vary between control platforms.
You can try the safe external checks on this page and one power reset when appropriate. If the code returns, repeated resets are not a substitute for diagnosis.
Do not continue if the error returns. Microwave internal circuits can retain dangerous voltage.
