external frameIf you notice either of these, you’ll need one of our expert technicians right away. Commonly, people notice that their air conditioner has a musty smell.(Image: https://p0.pikist.com/photos/1006/546/ac-repair-copper-welding-indoor-unit-thumbnail.jpg) This can happen when the water in the drain pan or drip lines starts accumulating. Consequentially, fungus and/or mildew can start to grow in your system.(Image: https://p0.pikist.com/photos/458/883/ac-service-in-india-ac-repair-ac-amc-thumbnail.jpg) Homeowners should first check the circuit breaker and reset it if necessary. They should also check the thermostat batteries and get them replaced if needed.