1 the transformer has failed due to a power surge.
Garage door fuse blown.
Look inside the fuse for charred glass or a broken filament evidence of a blown fuse.
3 the circuit board itself is faulty.
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Now you need to locate the blown fuse.
Most craftsman openers do not have any type of fuse though some older models did have a reset button.
They act as a safety device to prevent an electrical fire.
Problems with the circuit breaker should only be handled by a professional.
Then you will need to determine which fuse has blown.
Turn off the main power switch to disconnect power to the fuse box.
Identify the broken fuse.
These devices are made up of wire that can melt and break an electrical circuit when the current exceeds a safe level.
Replace the blown fuse with one of the same type and amperage.
In most cases a tripped circuit breaker is caused by a temporary overload on the circuit or a short circuit in some device plugged into the circuit.
Here is what may cause your garage door opener to not power on.
Often times however a more serious issue will prevent an operator from receiving power such as a blown fuse or circuit breaker.
Check the labeled area that corresponds to the part of the house that lost power.
The owner s manual would tell you if your model has a reset and cover how to use it.
With the main power still off unscrew the blown fuse and remove it.
2 the glass fuse on the circuit board has blown or popped.
Garage doors sometimes seem to have a mind of their own often deciding when and how far they want to open or close.
A blown fuse may be discolored cloudy or have a melted or broken metal piece inside.