I have a York heater that won't heat our second floor. The indicator LED light flashes three times which means the Pressure Switch is Stuck Open. Is there a way I can fix this myself? If so, how?

Thanks in advance for any help.

John

Check to be sure the draft inducer/combustion air blower is working first.

Is so then check the plastic/vinyl line to the switch for obstructions.

Then jumper pressure switch to test fire only.

If that works Replace the pressure switch and do not leave the jumper wire installed to run the furnace ((to dangerous). Just get the part and replace it.

Is there a site I can get schematics on to find and trace all the referenced pieces?

John

Quote:

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Originally Posted by hvac1000

Check to be sure the draft inducer/combustion air blower is working first.

Is so then check the plastic/vinyl line to the switch for obstructions.

Then jumper pressure switch to test fire only.

If that works Replace the pressure switch and do not leave the jumper wire installed to run the furnace ((to dangerous). Just get the part and replace it.

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I did what you said, and now I don't even get LED lights except the first initial ones - therefore I can't even tell the problem now.

Unjumper switch. Turn off all 120 volt power to the furnace and wait 5 minutes. Then turn power back on and let the unit fail. Then read the blinks and look at your chart.