Whirlpool Microwave: not lighting

Possible Causes

Burnt‑out interior light bulb

How to Identify: Bulb shows no illumination; visual inspection may show darkened glass or broken filament; other components function normally.

Part: Interior light bulb (incandescent or halogen)

Faulty light socket or loose bulb connection

How to Identify: Bulb not lighting even after replacement; socket may show corrosion or loose contacts.

Part: Light socket / bulb holder

Faulty or unpowered control board

How to Identify: No voltage to light socket on testing; other functions intermittent or control issues present.

Part: Main control board / lighting circuit

Defective door switch affecting light circuit

How to Identify: Light does not turn on when door is open; microwave functions otherwise; switch may fail continuity tests.

Part: Door safety switch

DIY Solutions

Replace interior light bulb

Easy 10–20 minutes

Tools Needed: Screwdriver (typically Phillips)

1. Unplug the microwave or disconnect power.
2. Remove light cover/panel to access bulb (location varies by model).
3. Unscrew and remove old bulb; inspect for broken filament.
4. Install new bulb with correct type/wattage and secure cover.
5. Restore power and test light function.

⚠️ Safety First: Always disconnect power before accessing internal components.

Inspect and reseat light bulb/socket

Moderate 15–30 minutes

Tools Needed: Screwdriver

1. Disconnect power to microwave.
2. Remove lamp cover and bulb.
3. Inspect socket for corrosion or bent contacts.
4. Clean contacts if accessible and reseat bulb firmly.
5. Reassemble and test light.
6. If still no light, proceed to socket testing with multimeter or replace socket.

⚠️ Safety First: Ensure power is off; avoid touching internal wiring with power connected.

Professional Repairs

Control board diagnosis and replacement

Estimated Cost: $150–$350+

Door switch replacement

Estimated Cost: $50–$150

When to Call a Professional

If DIY bulb and socket replacement does not resolve the issue

When interior electrical testing (voltage checks) is needed

If other microwave functions also fail or display/control issues appear

Preventive Maintenance

• Inspect the interior light bulb annually: Unexpected bulb failures
  Frequency: annually
• Clean light cover and socket area: Poor contact due to dirt or corrosion
  Frequency: semi‑annually

Frequently Asked Questions

Why is my Whirlpool Microwave not lighting?

The most common reasons include a burnt-out interior light bulb or a faulty light socket.

How do I fix Whirlpool Microwave not lighting myself?

To fix it, replace the bulb or inspect the socket connection by removing the light cover.

How much does it cost to fix not lighting?

Professional repairs for this issue can range from $50 to $350, depending on the cause.

When should I call a technician for not lighting?

Call a technician if the DIY fixes don't work or if the control board needs replacement.

References & Sources

• Whirlpool Cavity or Interior Light Not Working - Over‑the‑Range Microwave Official
• Whirlpool Microwave Lights are not Illuminating - Countertop Microwave Official

Can I Fix This Myself?

33%

DIY Success Rate Difficulty: Professional

Common Issues Reported by Users

• Control board malfunction (2 mentions)
• Light socket issue (1 mentions)

User Suggested Solutions

1. Replace the TRIAC or the control board if necessary.

   Success rate: 33.0%

Community Discussions

light won't turn on

Replace the TRIAC or the control board if necessary.

DIY View on Reddit →

Source: Reddit r/appliancerepair