Gas Furnace Pressure Switch Error

The pressure switch on a lennox g16 gas furnace monitors whether the air blower is in operation.

Gas furnace pressure switch error.

4 a dirty or stopped updraft inducer. Backdrafting can cause the dangerous gases created in the combustion process like carbon monoxide to enter into your home s air supply. Gas furnace inducer motor. Some other things that cause furnace pressure switch problems are.

I don t think inducer motor is answered by a verified hvac technician. As noted above the pressure switches used for gas furnaces are almost always normally open. The switch activates with air force pushing a plunger in the mechanism which closes the circuit bypassing the switch is not a repair only a troubleshooting technique to isolate a problem. Pressure switch error code at least 10 years old.

Remove the wires from the pressure switch. If it is closed prior to call it will go into fault because the switch is clearly jumpered the circuit shorted or the switch failed closed. The board first checks the switch to ensure it is open prior to inducer call. On a call for heat the inducer should start.

Using a cloth and a wire brush remove any blockages and dirt from the secondary exchanger and the inducer. 1 a restricted vent pipe 2 too long of vent piping and too many turns which exceeds manufacturer s recommendations 3 a stopped up condensate drain line if you have a high efficiency condensing furnace. Your furnace s pressure switch is a safety feature that ensures the gases created in the combustion process exit your home and aren t reintroduced into your system an issue called backdrafting. The plunger may not be pulling in completely and may only bob around when the pressure builds up inside the furnace.

To test this recycle the furnace. Once it warmed up outside the furnace started working again. When there is a call for heat and the inducer starts if after 1 2 minutes the inducer shuts off and pressure switch code comes on the pressure switch is not closing. Gas furnace pressure switch malfunctioning on cold days.