How to Troubleshoot a Coleman HVAC

Visually inspect the system and ducts for signs of corrosion or leaking. The furnace portion of the system may have soot or oil leaks in areas that are malfunctioning, while the air conditioning portion might have water leaks that indicate repair needs. Holes in the ducts require repairs to make the system more efficient.

Verify the Coleman system is getting power. Check your breakers to ensure they are all turned on because a short in the system sometimes shuts off a breaker as a safety feature.

Power off the system. Clean the condenser and evaporator coils in the system because dirty coils impede HVAC function. Vacuum and dust the coils first to eliminate loose dirt and then spray them with a coil-cleaning foam. Vacuum extra foam off with a shop vac after it has set for a few minutes and then rinse the coils off. Dry them with a rag.

Look at the burner on the furnace to verify that it is properly burning. Clean the burner in accordance with your manual and adjust the gas flow on gas furnaces to ensure the flame is appropriate for your system's needs.

Turn the thermostat up and down to verify the thermostat is properly controlling the HVAC system. If the system is unaffected by the thermostat, the thermostat likely needs replacing.

Replace all the filters in the HVAC system. A clogged filter prevents proper airflow and sometimes causes overheating and poor performance.

Request professional maintenance if the system is still not functioning optimally. Coleman recommends a maintenance inspection be made annually for best results.