HVAC Troubleshooting Guide

You may have a tripped circuit breaker in your home

• First Course of Action – Check your home circuit breaker box
• Suggested Solution – Reset circuit breaker

Your thermostat may be off or set incorrectly

• First Course of Action – Make sure your thermostat is on and set to cool
• Suggested Solution – Reset thermostat to your desired temperature

Your indoor unit is running but the outdoor unit is not

• First Course of Action – Make sure your thermostat is on and set to cool
• Suggested Solution – Reset thermostat to your desired temperature

If the above troubleshooting steps do not assist, please call DFH for help at (502) 968-6222.

Check your air filter

• First Course of Action – Check the filters in your unit
• Suggested Solution – Clean or replace filters as recommended in your use & care manual. If the problem persists, please contact us.

Your thermostat may be off or set incorrectly

• First Course of Action – Make sure your thermostat is on and set to heat
• Suggested Solution – Reset thermostat to your desired temperature

You may have a tripped circuit breaker in your home

• First Course of Action – Check your home circuit breaker box
• Suggested Solution – Reset circuit breaker

Check your air filter

• First Course of Action – Check the filters in your unit
• Suggested Solution – Clean or replace filters as recommended in your use & care manual. If the problem persists, please contact us.

Your system may have frozen up as the result of a dirty coil

• First Course of Action – Check for signs of water below the unit and a cold exterior surface of the indoor coil enclosure
• Suggested Solution – Contact us. In the meantime, turn your thermostat off and the fan “on” for 1–3 hours until airflow returns to normal

Schedule a service visit

• Suggested Solution – Contact us to set a time to get your equipment serviced.

Your system could be trying to reach a set point that is too extreme

• First Course of Action – Check the set point on your thermostat. Is it very low (summer) or very high (winter)?
• Suggested Solution – Adjust your thermostat. If that doesn’t work, please contact us.

The overflow switch is probably not working

• First Course of Action – Turn your system off
• Suggested Solution – Contact us

Check the batteries

• Replace the batteries if the display is dark or blank.

Inspect circuit breakers

• Ensure the circuit feeding the system hasn’t tripped.

Program correctly

• Verify and adjust the schedule/settings as needed.

Check thermostat settings

• Ensure the thermostat is set to “cool,” not “heat,” and that the fan is on “auto,” not “on.”

Inspect air filters

• Dirty or clogged filters reduce cooling efficiency and can cause warm air. Replace or clean the filters regularly.

Check refrigerant levels (pro)

• Low refrigerant can cause warm air. If suspected, contact a professional to diagnose and address any leaks.

Rattling noise

• Loose panels or debris can cause rattling. Inspect for obstructions and tighten any loose components.

Buzzing noise

• Persistent buzzing from the outdoor unit may indicate a refrigerant issue or heavy usage. Turn off the AC for a few hours and check the condenser fan. If in doubt, consult an HVAC technician.

Squealing or screeching

• Usually from worn parts or lack of motor lubrication. Regular maintenance and timely repairs help prevent failures.