Error: Pressure Switch Stuck Open/Closed

Old 12-18-10, 11:15 AM
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Error: Pressure Switch Stuck Open/Closed

One of my furnaces is giving the Pressure Switch Stuck error. I've swapped the switch and hose with my other furnace and it still doesn't work. The other furnace continues to work with swapped parts.

Here's the sequence of what is working on the non-functioning gas furnace:
inducer fan turns on
gas is ignited
just as the blower fan is turning on to blow the heat into the house the flame goes out--hence only cold air is blown.
at this point the LED indicator displays the code for Pressure Switch Stuck open/closed.

Should I swap the mother board or is there another best next step?
Old 12-19-10, 07:13 AM
Join Date: Feb 2009
Location: pittsburgh pa
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you have e venting this a 80 or 90 percent unit.for a 90 percent unit ,it will use pvc need to check for obstructions in the piping. if it uses 2 pvc pipes then you must check both...if yo are sure the venting system is clear...then the other possibility is that yo have a crack in the heat exchanger..get a carbon monoxide detector...what make and model is this?

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