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Step 1: Unplug the fireplace heater
Step 2: Remove 12 screws on the back of fireplace and remove the rear cover.
Step 3: You will find 1 X 40W Type B-10 bulb under log-set bed.
Step 4: Loosen and remove burnt out bulb and replace with new bulb.
Step 5: Close the rear cover and secure with the 12 screws.
Step 6: Plug in the unit.