Determining whether your central air conditioning unit has frozen solid requires a quick physical inspection of both the indoor and outdoor equipment. Step 1: Go to your indoor air handler or furnace closet and look at the copper refrigerant lines; if the thick suction line is coated in white frost or solid ice, the system is frozen. Step 2: Open the blower compartment door and look at the evaporator coils; they will appear encased in a block of white ice. Step 3: Go outside to your outdoor condenser unit; if the service valves are covered in frost or ice, freezing has occurred. Verification: Inspect copper lines and coils visually for solid ice buildup.
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