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Old 10-31-2010, 02:41 PM   #1
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pressure switch is open

i have three led lights and on the code sheet it tells me that if it blinks two times and the paused for two seconds that the pressure switch is open. looking at the diagram on the front panel the only thing that i can find thats says pressure switch is these two circular pieces that are 2 inches or so around with two wires and a hose attached to them. it looks fairly simple to replace by myself and hope to save a couple of bucks on repairs. if any one can tell me if they are the pressure switches that how do i tell what one is bad or just replace both.


Last edited by slowplayed28; 10-31-2010 at 02:44 PM.
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Old 10-31-2010, 03:05 PM   #2
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Unfortunately the code tells you what is happening

Pressure switch is open when it should be closed.

These are some things to looks at before replacing the pressure switch

1. Flue restriction
2. Inducing motor is coming up to full speed. Checked by a manometer
3. Finally the pressure switch.

The codes tell a tech what the fault is and the tech should take approiate steps.

Is this a 80 or 90+ % furnace?


John Wayne once said "Life is tough and it is even tougher if you are stupid"

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Old 10-31-2010, 08:43 PM   #3
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Just to add to plumbers list, check the hoses and nipples that the hoses connect to from the pressure switches. Often times the hole in those nipples will get a crusty build up so the pressure switch will not close. Pretty rare for a pressure switch to fail but it does happen once in a great while.
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