Seeing the Light: How to Test and Change an Oven Bulb

⚠️ SAFETY FIRST: IMPORTANT

Electricity can be lethal. Before attempting any repair, ensure the appliance is fully isolated from the mains power. If you are not confident using a multimeter or working with high-voltage components, consult a qualified engineer. Never work on a "live" circuit.

Is your oven in the dark? A blown bulb won't stop your oven from cooking, but it makes it nearly impossible to check if your cakes are rising or your roast is browning without opening the door and letting the heat out. In this guide, I’ll show you how to change the bulb from inside the oven and how to use a multimeter to test the light circuit from the back.

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The Two Ways to Test

1. The Visual Check: Most of the time, a bulb is obviously blown (darkened glass or a snapped filament).

2. The Rear Test (For Pros): If you already have the back panel off for other repairs, you can test the bulb without unscrewing it.

   • The Method: Pull the two wires off the bulb housing at the rear. Set your multimeter to Continuity/Ohms.

   • The Result: A good bulb will give a reading. If the multimeter stays on "OL" (Open Loop), the bulb's internal filament is broken.

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Step-by-Step Replacement

1. Cooldown: Ensure the oven is stone-cold.

2. The Glass Cover: Unscrew the glass lens (usually counter-clockwise). Pro Tip: If it’s stuck due to grease, use a piece of dry cloth or a rubber jar opener for extra grip.

3. The Bulb: Unscrew the old bulb and replace it with a heat-resistant 300°C rated bulb (usually SES E14).

   • Never use a standard household LED or incandescent bulb—they will melt or explode in oven heat!

4. Seal it Up: Screw the glass cover back on firmly to keep grease out of the new bulb’s socket.

Here is the steps blow to change a light bulb in an cooker oven 

Buy cooker and oven spares from Ebay UK here 

Buy a good Multimeter here on Ebay UK 

if you want to test bulb from rear pull of the connections 

connect multimeter and set to continuity ohms reading 

Buy Multimeter here 

a reading shows the bulb as good but ill show replacement anyway 

look for the glass bulb cover it should screw off 

to reveal the bulb now unscrew the bulb 

then screw in new bulb and screw in the glass cover to protect bulb etc from oven heat 

how to test bulbs video