Gas Furnace Pressure Switch Troubleshooting

Lennox pressure switches and carrier pressure switches are two popular furnace pressure switch brands but it is best to purchase based on your furnace model number.

Gas furnace pressure switch troubleshooting.

Also the fittings that the tubing fit into should be clear. The pressure switch has a pressure at which it closes which is typically negative. The furnace then runs awhile longer and this crazy cycle repeats pressure switch glitches open gas shuts off furnace starts another ignition cycle. Ensure the draft is above the required pressure.

It should be clear. Other problems that could cause the pressure switch to not open are a dirty. The pressure switch is an indicator of pressure problems in the furnace. A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and.

The switch activates with air force pushing a plunger in the mechanism which closes the circuit. Check the tubing from the inducer. The pressure switch fitting may have a restrictor inside do not remove. The switch is there to prevent the furnace from running unless the correct venting air pressure is present.

If your lennox does not activate normally during the ignition sequence try running a quick bypass of the pressure switch to determine if it is the. A furnace pressure switch is a safety device located near the draft inducer motor of a gas forced air furnace. Here is a quick breakdown of the steps involved in replacing a gas furnace pressure switch once you have sourced your new part. A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace.

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