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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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The name is Serguei. I have a York furnace. yp9c080c16mp12ca

Customer Question

Hello. The name is***** have a York furnace. yp9c080c16mp12ca I get 3 flashes error code. Cleaned the tubes, made sure they click. The 3 flashes code happen "before" the ventor motor even begins, not after. But if I disconnect the pressure sensor (a 3 wire sensor that connects with tubings between ventor motor assembly/pressure switch/pressure sensor. Then Ventor motor at least starts. changed control board as well. Same thing is happening
JA: Thanks. Can you give me any more details about your issue?
Customer: 3 flashes error code. Which means pressure switch stays open. But error code comes before the ventor motor even starts. Pretty much within 2-3 seconds of beginning operation. Changed Control Board. Same problem. If I disconnect the Pressure Sensor. The Ventor Motor 'does' start, giving me a 3 flashes code after a few min of trying to make things close.
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Submitted: 1 year ago.
Category: HVAC
Expert:  gotoman for ac replied 1 year ago.

Serguei .. Problem is pressure switch. Common problem on this unit. Weak diaphragm in switch. Replace switch. Russ

Expert:  gotoman for ac replied 1 year ago.

Contact at(###) ###-#### Part is in stock there. Model and serial number ready. Russ

Customer: replied 1 year ago.
I'm given an error that pressure switch fails to close, even before ventor motor starts. And you think it's the pressure switch that's failed?
Customer: replied 1 year ago.
Okey. I've ended up calling York and it's not the pressure switch's problem. One of the wires on the sensor, that 3 wire thingy is broken. You guys have been no help. Sorry.
Expert:  gotoman for ac replied 1 year ago.

Sometimes it better to be there but flow charts indicated bad air switch. Thanks Good Luck. Nice dealing with someone that ask the right questions. Russ