Mars Furnace takes too long to heat the home

01 - Mars Furnace Control Board

The control board regulates the power supply to all of the components of the furnace. If the control board is faulty, it may only send intermittent voltage to the ignition system, causing the furnace to take too long to heat the home.

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02 - Mars Furnace Main Control Board

The main control board regulates the power supply to all of the components of the furnace. If the control board is faulty, it may only send intermittent voltage to the ignition system, causing the furnace to take too long to heat the home.

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03 - Mars Furnace Pressure Switch

The pressure switch closes when the burner has sufficient airflow. If the pressure switch isn’t working, it might not close when the proper airflow is present, resulting in the furnace taking too long to heat the home. If the ignition process stalls, the furnace will shut off. To determine if the pressure switch is defective, use a multimeter to test the switch for continuity. If the pressure switch does not have continuity, replace it.

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04 - Mars Furnace Hose

The air traveling through the pressure switch hose will put a negative pressure or vacuum on the switch, causing it to close when the burner has sufficient airflow and allowing the ignition process to continue. If the hose has a hole in it, or is not securely fastened to the switch, the pressure switch may only close intermittently, resulting in the furnace taking too long to heat the home. Inspect the pressure switch hose for any damage and replace if necessary.

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05 - Mars Furnace Tube

The air traveling through the pressure switch tube will put a negative pressure or vacuum on the switch, causing it to close when the burner has sufficient airflow and allowing the ignition process to continue. If the tube has a hole in it, or is not securely fastened to the switch, the pressure switch may only close intermittently, resulting in the furnace taking too long to heat the home. Inspect the pressure switch tube for any damage and replace if necessary.

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06 - Gas Supply Problem

Check the gas control valve to ensure that it is turned on and there is gas present at the valve. Natural gas pressure should be close to 4 inches water column at the furnace input; propane pressure close to 11 inches water column at the furnace input. The gas pressure can be checked with a manometer at the valve. Low gas pressure can cause a weak flames and inconsistant lighting.

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