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Rooftop unit repair: a bare compressor wire and a blown fuse

Des Plaines, ILJune 2025Rooftop unit

A hand holding a fuse block and a scorched cartridge fuse taken out of a rooftop unit, the open unit and test leads on the roof behind.
The terminal box of a rooftop unit compressor with its cover opened, showing the wiring connections on the compressor shell.
A Fieldpiece digital refrigerant manifold hung on a packaged outdoor unit next to its rating plate, showing pressure and temperature readings.
Pressure and temperature readings during the rooftop service call.

What we found

A compressor wire with its conductor exposed, and a blown fuse.

What we did

Insulated the exposed wire and replaced the fuse.

Something doing the same thing at your house?

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