Determining whether an electrical fuse in your HVAC disconnect box is blown involves checking for physical damage and electrical continuity. Step 1: Turn off the main circuit breaker to ensure complete safety from high-voltage shocks. Step 2: Pull the cartridge fuses out of the outdoor disconnect block. Step 3: Look closely at the internal glass tube or mesh screen; if the metal wire inside is melted, blackened, or broken apart, the fuse is blown. Step 4: Test with a multimeter set to continuity mode. Verification: A functioning fuse will register zero resistance, whereas a blown fuse will show an open line.
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