A blown fuse may be discolored cloudy or have a melted or broken metal piece inside.
Garage door fuse blown.
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.
Turn off the main power switch to disconnect power to the fuse box.
Identify the broken fuse.
1 the transformer has failed due to a power surge.
They act as a safety device to prevent an electrical fire.
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Then you will need to determine which fuse has blown.
Check the labeled area that corresponds to the part of the house that lost power.
Look inside the fuse for charred glass or a broken filament evidence of a blown fuse.
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.
Often times however a more serious issue will prevent an operator from receiving power such as a blown fuse or circuit breaker.
Replace the blown fuse with one of the same type and amperage.
The owner s manual would tell you if your model has a reset and cover how to use it.
Problems with the circuit breaker should only be handled by a professional.
Most craftsman openers do not have any type of fuse though some older models did have a reset button.
2 the glass fuse on the circuit board has blown or popped.
Here is what may cause your garage door opener to not power on.
Sometimes the fix can be as simple as replacing the batteries in the opener.
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Garage doors sometimes seem to have a mind of their own often deciding when and how far they want to open or close.