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