The furnace runs, but some rooms are too cold while others are too warm.

Safety first: Turn off the power before reaching into ductwork or blower compartments.

Steps:

• Check supply registers: Ensure registers in cold rooms are fully open and not blocked by furniture or rugs.
• Adjust dampers: If manual dampers are installed in branch ducts, adjust them to increase airflow to colder rooms and slightly restrict warmer rooms.
• Inspect return grilles: Ensure return grilles are unobstructed to allow adequate airflow back to the furnace.
• Blower speed settings: A technician can adjust the blower speed via the Danfoss control or motor taps to optimize airflow.