KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave LIGHT OUT Error Fix: Interior Light Not Working

Interior cavity light does not turn on during cooking or when door is opened. Replace the light bulb (standard appliance bulb). On OTR models, there is also a separate surface light underneath for the cooktop below. Access from underneath the microwave on OTR models.

Low severity2 fixes available

Quick Answer

Error LIGHT OUT on the KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave means: Interior Light Not Working. The top-ranked community fix is “Replace Interior Light Socket Assembly” (medium difficulty, ~45 min, DIY cost: $10-$20). 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: $120-$180.

Other KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave Error Codes

ARCING INSIDE

Arcing / Sparking Inside Cavity

2 fixes

DOOR LATCH BROKEN

Door Latch / Handle Broken

2 fixes

Oven Cavity Thermistor Open/Shorted

2 fixes

Shortkey / Keypad Shorted

2 fixes

Touchpad / Keypad Open Circuit

2 fixes

Control Board Failure

2 fixes

FAN NOISY

OTR Exhaust Fan Noisy or Weak

2 fixes

Sensor Error — Humidity Sensor

2 fixes

People Also Ask About KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave Error LIGHT OUT

What does error code LIGHT OUT mean on a KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave?

Error code LIGHT OUT on the KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave means: Interior Light Not Working. Interior cavity light does not turn on during cooking or when door is opened. Replace the light bulb (standard appliance bulb). On OTR models, there is also a separate surface light underneath for the cooktop below. Access from underneath the microwave on OTR models.

How do I fix error code LIGHT OUT on my KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave?

The most successful fix is "Replace Interior Light Socket Assembly" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code LIGHT OUT on a KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave serious?

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

Can I fix KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave error LIGHT OUT myself?

Yes — the top-ranked community fix ("Replace Interior Light Socket Assembly") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Phillips screwdriver, Multimeter.

How much does it cost to repair KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave error LIGHT OUT?

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave have?

The KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave has 8 other known error codes, including: ARCING INSIDE (Arcing / Sparking Inside Cavity), DOOR LATCH BROKEN (Door Latch / Handle Broken), F1 (Oven Cavity Thermistor Open/Shorted), F2 (Shortkey / Keypad Shorted), F3 (Touchpad / Keypad Open Circuit), and 3 more.

What other error codes does the KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave have?

The KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave has 8 other known error codes:

ARCING INSIDE — Arcing / Sparking Inside Cavity (2 fixes)
DOOR LATCH BROKEN — Door Latch / Handle Broken (2 fixes)
F1 — Oven Cavity Thermistor Open/Shorted (2 fixes)
F2 — Shortkey / Keypad Shorted (2 fixes)
F3 — Touchpad / Keypad Open Circuit (2 fixes)
F5 — Control Board Failure (2 fixes)
FAN NOISY — OTR Exhaust Fan Noisy or Weak (2 fixes)
SE — Sensor Error — Humidity Sensor (2 fixes)

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