To reset an air conditioner that is running but failing to blow cold air, follow a safe electrical shutdown procedure. Step 1: Turn your indoor thermostat mode switch to the "Off" position. Step 2: Go to your home's main electrical breaker panel and flip the dual-pole HVAC circuit breaker to "Off." Step 3: Leave the system powered down completely for 15 to 30 minutes to allow internal control boards to clear errors and refrigerant pressures to equalize. Step 4: Flip the circuit breaker back on and wait 10 minutes before turning your thermostat to "Cool." Verification: Listen for the outdoor condenser fan and compressor to engage normally.
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