Trane Gas Furnace Pressure Switch Error

The pressure switch fitting may have a restrictor inside do not remove.

Trane gas furnace pressure switch error.

Let me clarify the bottom side of the pressure switch is the intake that has a small white flexible hose attached to it that runs down into air intake area. A pressure switch senses pressure within the flue system. One goes to the gas valve and the other one goes to the bottom of the furnace where the burners are. One potential error is a furnace lockout which is not something that every furnace user knows about.

Check the tubing from the inducer. It should be clear. Trane xr 90 gas furnace that is coming up with three flashing led lights saying that its the pressure switch witch was replaced last spring the vents are open whats my next move read more rick. Inspect the pressure switch hose.

Also the fittings that the tubing fit into should be clear. Vent pressure error three flashes on the trane furnace control board means that the vent pressure is too high or too low which then activates the pressure switch and causes a lockout. Remove the main access panel on the front of the furnace. The exhaust side of the pressure switch actually splits into two hoses.

When a pressure switch error occurs the system will shut down and no warm air will enter the home. Inspect the hose s connected to the pressure switch to make sure it is connected at both ends and is in good condition. Then three service calls a limit sensor a pressure switch a blower motor. 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.

There s a motor engaging but after 5 speed ups the system disengages with the 3 flash error code for the inducer fan or pressure switch. And about 400 later the problem still existed. This error code remains flashing through the next cycle until the moment that the furnace should activate then disengages and errors out again. Other problems that could cause the pressure switch to not open are a dirty blower wheel on the inducer.

A pressure switch error on a trane furnace may lead to a very cold home if not corrected in a timely manner. If the hose is cracked replace it. The pressure switch is an indicator of pressure problems in the furnace. This is for anyone experiencing pressure sensor limit switch issues with the xr series trane furnaces i went the end of one winter seasons and the beginning of the next trying to resolve this issue.