How to Troubleshoot Inverter Mini Splits

Check the mini-split's circuit breaker at the main electrical panel. The breaker may have tripped, causing no power at the inverter mini-split system. Reset the breaker, if necessary.

Confirm that the batteries in the mini-split's remote control are full voltage. The remote can act erratic or not function at all, with low battery output. Place a multimeter's leads across each individual battery. The voltage should range between 1 volt and 1.2 volts. Replace the batteries if the voltage is below 1 volt.

Check the air filter. The air filter needs to be cleaned twice a month. A dirty air filter blocks the air flow, causing less cool air output or no output at all. Vacuum or wash the filter and reinsert it into the indoor unit.

Verify that the indoor and outdoor units have adequate spacing around their perimeter. Remove any blockages, such as stacked boxes or furniture, from the system components. Blocked vents impede the system's ventilation, causing the unit to run hot and possibly tripping a circuit breaker.

Confirm the mini-split's mode selection. The heating mode requires a few minutes of waiting before hot air will be produced. Allow the unit to run through its system checks to protect the compressor's functions. The unit should turn on normally after a few minutes.