The bulb used should not exceed 2 375 in diameter and 4 43 in length.
How to change light bulb in chamberlain garage door opener.
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Set a step ladder under the power head of the garage door opener so you can reach the power cord and the lens cover safely.
The model is hbw0777 installed back in feb.
Turn off the circuit breaker to the garage door opener if your opener is hardwired into the circuit.
Step 2 climb the ladder and pull the power cord from the outlet in the ceiling.
Unplug your liftmaster garage door opener from the electrical outlet in the ceiling.
If the light is not working unscrew the bulb.
Chamberlain manufactured garage door openers are designed and tested to be used with size a19 incandescent light bulbs and similar sized compact fluorescent light cfl bulbs.
Press the two lens tabs in to disengage the lens from the power head.
Once the bulb is in turn the switch on before closing up the cover.
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This video shows how to replace a defective light socket and back panel on a sears craftsman garage door opener.