Trane A/C Troubleshooting Flowchart

Is your air conditioner... The problem might be your... What's wrong? How you can fix it
Thermostat Check the batteries. They may be dead, or the thermostat may be on the wrong setting. Replace the batteries in your thermostat and double check that it’s on the cool setting.
Circuit breaker The breaker switch may be turned off. Flip the switch back to the “on” position.
Not blowing cold air? Air filter The filter needs to be clean to do its job. If it’s clogged with dirt or dust, it won’t work. Replace or clean your filter to allow air to blow better.
Outside unit If the area around the unit has foliage, furniture or debris laying around it can stop air from flowing correctly. Clear a two-foot space around your air conditioner and keep it clean so that nothing blocks the airflow from your unit.
Refrigerant Leaking refrigerant will cause the unit to be less effective since there is not enough cooling fluid to work. A professional HVAC technician can fix this for you.
Insulation Without insulation, air can leak out from your home. Cracks, windows and doors are common areas where this happens. Consider upgrading your windows to ones that are more insulating or use blackout curtains to keep the sun and heat out.
Dripping water? Condensate line The pipe leaving your air conditioner may have debris inside it. Use compressed air to remove the clog.
Drain line If the drain pan is full, it can cause the drain line to be blocked and water to overflow. See if there are any blockages in the drain line and clear them. Empty your drain pan as well.
Making odd sounds? Blower motor or belt Squeaking sounds are typically from the belt or the blower motor. Lubricant can help the parts to run smoothly without squeaking.
Fan blades If the sound is like a card in a bicycle spoke, then it’s likely that something is stuck between the blades. Turn off the unit, open it carefully and check if there is something caught between the blades and extract it gently.