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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My problem is with a York furnace. 2 flashing red lights,

Customer Question

Customer: ***** *****, and my problem is with a York furnace. 2 flashing red lights, says pressure switch stays closed
JA: Thanks. Can you give me any more details about your issue?
Customer: Furnace will not light
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Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Most likely a defective switch if it is not opening

Customer: replied 1 year ago.
I changed the switch, if I suck on the hose, switch closes
Customer: replied 1 year ago.
switch is NO
Customer: replied 1 year ago.
Furnace will not light, purge is not satisfed
Customer: replied 1 year ago.
there are 2 switches, 1 @ -.2 one at -.6
Expert:  airheatman replied 1 year ago.

OK if the switch is N/O and you suck on and it closes,that means it is indeed OPEN .Board is giving a false reading if it shows it stuck closed.

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