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When your HVAC system stops working, the first step is to rule out the most common problems. Start by checking the thermostat settings, ensuring that it’s set to “cool” or “heat” and that the temperature is set above or below the current room temperature. Next, inspect the circuit breaker or fuse box for tripped breakers or blown fuses. If the system still won’t turn on, examine the air filter— a clogged filter can prevent airflow and cause the unit to overheat.
For cooling units, verify that the condenser coils are clean and that the outdoor unit isn’t obstructed by debris. If the indoor unit’s fan isn’t spinning, the motor may need lubrication or replacement. In heating mode, check the pilot light or gas supply for proper operation. If you’re unsure about any step, contact a licensed HVAC technician for safe and accurate repairs.