📡Microwave

E-21

Samsung · Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave

Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave E-21 Error Fix: Touchpad / Key Error

The touchpad key matrix has a fault. One or more keys are registering incorrectly or not at all. This differs from SE in that E-21 indicates a specific matrix line fault rather than a stuck key. The touchpad membrane or user interface board needs replacement.

warning2 fixes available✨ Free fix available

Quick Answer

Error E-21 on the Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave means: Touchpad / Key Error. The top-ranked community fix is “Replace the Touchpad Membrane or User Interface Board” (medium difficulty, ~45 min, DIY cost: $15-$25). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · microwave

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many microwave repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $150-$220.

Other Samsung Models with Error E-21

Samsung ME21M706BAS 2.1 cu. ft. Over-the-Range Microwave

microwave · 2 fixes

Other Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave Error Codes

C-d0

Main Board Communication Error

2 fixes

C-d1

Sub-Board Communication Error

Door Sensor Error

Magnetron Overheat

Magnetron / Inverter Error

2 fixes

E-13

Inverter Board Failure

2 fixes

E-22

Relay Stuck Closed — Safety Hazard

2 fixes

E-23

Display Board Communication Error

2 fixes

People Also Ask About Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave Error E-21

What does error code E-21 mean on a Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave?

Error code E-21 on the Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave means: Touchpad / Key Error. The touchpad key matrix has a fault. One or more keys are registering incorrectly or not at all. This differs from SE in that E-21 indicates a specific matrix line fault rather than a stuck key. The touchpad membrane or user interface board needs replacement.

How do I fix error code E-21 on my Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave?

The most successful fix is "Replace the Touchpad Membrane or User Interface Board" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code E-21 on a Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave serious?

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave error E-21 myself?

Yes — the top-ranked community fix ("Replace the Touchpad Membrane or User Interface Board") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Plastic pry tool.

How much does it cost to repair Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave error E-21?

DIY cost: $15-$25. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave have?

The Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave has 8 other known error codes, including: C-d0 (Main Board Communication Error), C-d1 (Sub-Board Communication Error), DOOR (Door Sensor Error), E-11 (Magnetron Overheat), E-12 (Magnetron / Inverter Error), and 3 more.

Which other Samsung models have the E-21 error?

Error code E-21 also appears on 1 other Samsung model: Samsung ME21M706BAS 2.1 cu. ft. Over-the-Range Microwave. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave have?

The Samsung Samsung MS19M8000AS 1.9 cu. ft. Countertop Microwave has 8 other known error codes:

C-d0 — Main Board Communication Error (2 fixes)
C-d1 — Sub-Board Communication Error (2 fixes)
DOOR — Door Sensor Error (2 fixes)
E-11 — Magnetron Overheat (2 fixes)
E-12 — Magnetron / Inverter Error (2 fixes)
E-13 — Inverter Board Failure (2 fixes)
E-22 — Relay Stuck Closed — Safety Hazard (2 fixes)
E-23 — Display Board Communication Error (2 fixes)

Which other Samsung models have the E-21 error?

Error code E-21 also appears on 1 other Samsung model:

Samsung ME21M706BAS 2.1 cu. ft. Over-the-Range Microwave (microwave) · 2 fixes

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