Guardian opener light does not turn on when door operates, but bulb is good.

Safety first: Turn off power and let bulbs cool before handling. Avoid touching live terminals.

• Verify bulb: Test the bulb in another fixture. Use a correct-wattage, opener-rated bulb.
• Check socket wiring: With power off, inspect the wires to the lamp socket for looseness or burns. Tighten or replace as needed.
• Test manual light button: If your Guardian wall console has a light button, press it to see if the light responds.
• Replace logic board: If the socket and bulb are good but the light never turns on with door movement or manual command, the light control circuit on the logic board is likely failed and the board should be replaced.