KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave FAN NOISY Error Fix: OTR Exhaust Fan Noisy or Weak

The ventilation fan is excessively noisy (grinding, rattling) or has weak airflow. Clean or replace the charcoal filter (for recirculating installations — replace every 6-12 months). Clean metal grease filters monthly. If filters are clean and fan is still weak/noisy, the fan motor bearings are worn and the motor needs replacement.

Medium severity2 fixes available

Quick Answer

Error FAN NOISY on the KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave means: OTR Exhaust Fan Noisy or Weak. The top-ranked community fix is “Replace Exhaust Fan Motor Assembly” (hard difficulty, ~90 min, DIY cost: $5-$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: $150-$250.

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

LIGHT OUT

Interior Light Not Working

2 fixes

Sensor Error — Humidity Sensor

2 fixes

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

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

Error code FAN NOISY on the KitchenAid KMHS120ESS 30 in. 1000-Watt Over-the-Range Microwave means: OTR Exhaust Fan Noisy or Weak. The ventilation fan is excessively noisy (grinding, rattling) or has weak airflow. Clean or replace the charcoal filter (for recirculating installations — replace every 6-12 months). Clean metal grease filters monthly. If filters are clean and fan is still weak/noisy, the fan motor bearings are worn and the motor needs replacement.

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

The most successful fix is "Replace Exhaust Fan Motor Assembly" (hard difficulty, ~90 minutes). Estimated DIY cost: $5-$20. HomeMD has 2 community-ranked fixes for this error.

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

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

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

Yes — the top-ranked community fix ("Replace Exhaust Fan Motor Assembly") is rated hard difficulty and takes about 90 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 FAN NOISY?

DIY cost: $5-$20. Professional repair typically costs $150-$250. 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)
LIGHT OUT — Interior Light Not Working (2 fixes)
SE — Sensor Error — Humidity Sensor (2 fixes)

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