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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
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: 11 months ago.
Category: HVAC
Expert:  gotoman for ac replied 11 months ago.

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

Expert:  gotoman for ac replied 11 months ago.

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

Customer: replied 11 months 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 11 months 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 11 months 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