Not necessarily; an air conditioner freezing into a block of ice does not automatically mean the entire system is permanently broken, but it does indicate a serious underlying operational failure. Freezing is almost always caused by severely restricted airflow (such as a dirty air filter or blocked supply vents) or a lack of heat absorption caused by low refrigerant levels. While the ice itself can be thawed safely by turning off the cooling and running the fan, the root cause must be repaired to prevent refreezing. Verification: Turn the system to "Fan Only" mode to thaw the coils completely and check your air filter.
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