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  1. #14
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,145

    Cool

    Quote Originally Posted by NotGettingSleep View Post
    I have been struggling for a week along with my HVAC guy to figure out what was wrong with my York. I had the exact same symptoms as PDX...furnace 3.5 years old, and it kept going to the 3-flash, pressure switch stuck open. Every once in a while it would give me a 6 flash or an 8 flash, but they all pointed to the pressure switch. The HVAC guy even replaced the pressure switch last week, but the problem persisted.

    I woke up at 4:30 this morning and the house was 59 degrees (Minnesota). I started turning the furnace off and on trying to override the failure just to get the house warmed up and that was when I got online and found this discussion. I appreciated some of the good suggestions, but I can say that we are now 100% sure we have fixed my problem and I wanted to share it.

    I have had a field tech coming almost every day for the last week and he just hadn't cracked the nut, so this morning the owner of the firm came out too. What the owner knows (because I have known him for years), that the field tech and you all don't know, is that I have a 2 year old boy who likes to be a stinker. The owner showed up and didn't even bother ringing the bell. Instead he walked to the back of the house, pulled the PVC venting loose at the first corner where it came out of the house, and the problem was solved. My boy had been dropping Class V rocks down the vent all summer and it was choking off the intake! It would be like trying to run a marathon with a mouthful of marbles!! Glad to have the problem solved and thought I would share it with all of you. Enjoy.
    Very funny. I have seen similar things before. IT is always the last thing you think of.
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  2. #15
    Join Date
    Oct 2006
    Location
    The Beach
    Posts
    747
    Also check the grade on the vent piping to make sure there is no condensate or any other material in the piping.
    Blue Fox

  3. #16
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,766
    If the tech had used a manometer, he would have seen the vent was the problem, and not the switch.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #17

    SERVICE LETTER

    SIMILAR SWITCHES ON LUX,COLEMAN.

    SERVICE INFORMATION
    Unitary Products
    5005 York Drive
    Norman, Oklahoma 73069
    1/8778747378
    Date: February 5, 2009 YS00209
    Revised
    To: All York Distributors
    All York Branches
    All Field Service Supervisors
    Subject: Pressure Switches PC9, PM9
    We have received several product reports regarding pressure switch problems on the 40”
    modulating 95% furnaces. (Switch P/N S102435308000/
    SAP# 157719 upflow models &
    S102435324000/
    SAP# 160209 downflow models)
    Investigation into these issues and analysis of field returned switches have shown that the
    fault code 3 is caused by high contact resistance on the electrical contacts within the
    pressure switch. On each ignition cycle, the modulating furnace control ramps the draft
    inducer blower up and down and verifies the pressure sensor and switch operation by
    comparing the switch opening and closing points, as measured by the pressure sensor, to
    the proper switch set point for that furnace model. If the electrical contacts within the
    pressure switch body become contaminated with a foreign material, the switch may close
    mechanically but may not close electrically at the calibrated set point, causing the control
    to detect a pressure switch that is open when it should be closed. This will result in a 3flash
    error code, and the furnace control will not continue the ignition sequence.
    To address this problem, the switch supplier has made a recent change to the switch
    construction to add an industrial contact lubricant that prevents contamination from
    adhering to the electrical contact surfaces. Testing has shown that this makes the contacts
    many times more resistant to contamination by foreign substances. Pressure switches
    with code dates of 0309 (third week of 2009) will have this new construction. Source 1
    should begin to have a limited supply of the new switches available for shipment by
    February 6 th .
    The contact contamination problem will not affect any of the NG33 models, even those
    without the contact lubricant on the pressure switch contacts. The contamination on the
    contacts is usually silicone carbide, the source of which is the silicone hose connected to
    the switch. Silicone molecules outgas from the hose and migrate to the switch contacts,
    eventually affecting the electrical connection. On the NG33 models, which do not have
    closed burner boxes, there is no silicone hose on the side of the pressure switch in which
    the contacts are located, and so there is no direct source for silicone contamination. The
    problem will also not affect previous singlestage
    or twostage
    models, since those
    models do not have pressure sensors that compensate for vent length and firing rate so
    they always provide a pressure level that insures the contacts are cleaned mechanically on
    each cycle.
    This YS letter will provide a replacement pressure switch and one hour labor at the
    dealers registered DOA labor rate. Due to the nature of this issue, we recommend that the
    dealers replace the switches now, instead of waiting for them to fail. Make sure you
    reference the YS letter number when filing claims for this issue.
    For any units in distributor inventory, this YS letter will allow for replacement of the
    pressure switch along with a fair and reasonable allowance. Contact Mark Freund at 4054196609
    for prior authorization to submit the billing for reworking your inventory.
    For repair parts in distributor inventory, contact your Source 1 account representative for
    a Return Authorization of switches with code dates prior to 0309.
    Mark Freund Robert Cabrera
    Mark Freund Robert Cabrera
    Manager, Residential Field Service Director, Indoor Products Engineering

  5. #18
    Join Date
    Jan 2010
    Posts
    24
    Venting (length, pitch, size and amount of elbows) should be checked. Condensate drain should be checked. No way that many pressure switches goes out in such a short time frame. Tech. should also check and make sure that the intake is not pulling the exhaust when the pvc is on the outside of the house. I have seen people install intakes where they are facing down into snow.

  6. #19

    SERVICE INFO YS-002-09

    SEE MY ABOVE POST. THIS IS A SERVICE LETTER FROM YORK ABOUT SPECIFIC PRESSURE SWITCHES ON CERTAIN MODELS THAT CAUSE ISSUES AND WHY. I RECENTLY ALSO FOUND THE SAME PROBLEM ON A HI END COLEMAN. THE TRICK IS TO CHECK THE PRESS SWITCH PART NUMBER AND CHECK IT AGAINST THIS LETTER. ALSO CHECK THE DATE CODE ON THE SWITCH.

  7. #20
    Join Date
    Jan 2010
    Posts
    24
    Anyway that you could email this to my email. My company does deal with their products and I would like to talk to the MFG rep guru about this the next time that I see him.

  8. #21
    Join Date
    Jan 2009
    Location
    Middle of the Oregon Coast
    Posts
    197
    osufan - Give Shae, Collin, or David a call, they can set you up with this and any other service bulletin that you need.
    The Lord must love stupid people or he wouldn't have made so many.

    Why is it that when I am in a hurry, everyone else on the road goes 15 MPH under the speed limit?

  9. #22
    Quote Originally Posted by GATORLITTLE View Post
    SEE MY ABOVE POST. THIS IS A SERVICE LETTER FROM YORK ABOUT SPECIFIC PRESSURE SWITCHES ON CERTAIN MODELS THAT CAUSE ISSUES AND WHY. I RECENTLY ALSO FOUND THE SAME PROBLEM ON A HI END COLEMAN. THE TRICK IS TO CHECK THE PRESS SWITCH PART NUMBER AND CHECK IT AGAINST THIS LETTER. ALSO CHECK THE DATE CODE ON THE SWITCH.
    MY LAST POST IS THE ACTUAL SERVICE LETTER. I COPIED AND PASTED IT FROM A PDF FILE. CANT ATTACH A PDF FILE TO MY POSTS ON HERE. IF YOU WANT THE PDF GIVE ME YOUR EXTERNAL EMAIL AND I WILL SEND IT.

  10. #23
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,855
    Quote Originally Posted by GATORLITTLE View Post
    MY LAST POST IS THE ACTUAL SERVICE LETTER. I COPIED AND PASTED IT FROM A PDF FILE. CANT ATTACH A PDF FILE TO MY POSTS ON HERE. IF YOU WANT THE PDF GIVE ME YOUR EXTERNAL EMAIL AND I WILL SEND IT.
    Good info but turn off your cap lock.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  11. #24
    Join Date
    Jan 2010
    Location
    WA
    Posts
    5

    York Affinity 9C Pressure Switch Problem...3 Red Code

    I had had 4 different Tech's and 6 visits in the last 2 months with a "Pressure Switch Stuck Open" error code. Tech's kept looking and came up with absolutely nothing. They were baffled as to why this unit worked randomly and shut off randomly. It would work and shut off with no rhyme or reason. We replaced the pressure switch...problem came back within two days. Replaced the board...problem came back again. Again, very good techs with no solution. We were frustrated and read everything online we could find. The one common theme was lots of York Pressure Switch issues on the online forums. The techs finally resorted to tearing the whole machine apart and literally looking at each component for problems...Open heart surgery in a sense. They came up with nothing!

    As the tech put the machine back together he moved a few wires to get them out of his way...The machine started up. He moved the wires again and it triggered the error code again. He began to reproduce the error code by moving the wires against each other. Bottom line is that it appeared that the higher voltage wires were causing some sort of misfire in the lower voltage wires that was in turn causing the pressure switch to have an error code. He separated the higher voltage wires out of the harness and the machine has run flawless since. FYI: He pulled the wires to the Pressure Switch out of the harness it was cable tied to (2 Blue wires to the top switch). They are now routed separately from the board to the switch. No problems!!! Voltage issue disguised as a pressure switch error code. Hopefully this helps you if you are struggling with the same issue. This solved our issues, it might be worth a try.

  12. #25

    Faulty Pressure Switch ?

    My York Affinity 9.V stopped working. My repairman told me that the problem is a faulty pressure switch. He claims that he has had numerous such failures this winter. I am now having to wait several (cold) days while the York distributor awaits delivery of "good" switches.

    That's his story.

  13. #26
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,145

    Cool

    Quote Originally Posted by jamesmcorey View Post
    My York Affinity 9.V stopped working. My repairman told me that the problem is a faulty pressure switch. He claims that he has had numerous such failures this winter. I am now having to wait several (cold) days while the York distributor awaits delivery of "good" switches.

    That's his story.
    That sucks.
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