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    mark08054's Avatar
    mark08054 Posts: 8, Reputation: 1
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    #1

    Feb 16, 2010, 04:52 PM
    York heater troubleshooting
    I have a york diamond 90 model P3UR
    When I raise the temp, the blower goes on, then I see the pilot get hot ( glow ), then blower goes on for about 30 seconds and shuts off. This goes for 3 cycles then stops. Tried cleaning the flame sensor... still does the same thing Can anyone help? Thanks
    ExperienceHelps's Avatar
    ExperienceHelps Posts: 1, Reputation: 1
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    #2

    Feb 16, 2010, 05:12 PM

    The flame sensor is a double pole switch. When the glow bar generates enough heat to make it change positions, the switch mechanically changes positions to a different circuit. If it does that 3 times, with regularity and shuts down, there is probably a safety lockout function on the control board. My first impression would be a faulty flame sensor.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Feb 16, 2010, 05:21 PM
    Quote Originally Posted by ExperienceHelps View Post
    The flame sensor is a double pole switch. When the glow bar generates enough heat to make it change positions, the switch mechanically changes positions to a different circuit. If it does that 3 times, with regularity and shuts down, there is probably a safety lockout function on the control board. My first impression would be a faulty flame sensor.
    What did he say?
    lil joe's Avatar
    lil joe Posts: 12, Reputation: 1
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    #4

    Feb 16, 2010, 08:03 PM

    I've read it 3 times and I'm not sure.
    johnair77's Avatar
    johnair77 Posts: 59, Reputation: 1
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    #5

    Feb 17, 2010, 07:28 AM
    Dpdt.. :)
    mark08054's Avatar
    mark08054 Posts: 8, Reputation: 1
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    #6

    Feb 17, 2010, 08:06 AM

    Dpdt? What does that mean?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #7

    Feb 17, 2010, 08:27 AM
    Dubble pole dubble throw
    mark08054's Avatar
    mark08054 Posts: 8, Reputation: 1
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    #8

    Feb 17, 2010, 08:42 AM

    So its not the flame sensor, right? What else?. hey guys I really thank you for your help. Let me know
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #9

    Feb 17, 2010, 09:03 AM
    https://www.askmehelpdesk.com/heatin...ng-447725.html

    Then test like this.
    Attached Images
  1. File Type: pdf Doc1.pdf (42.4 KB, 198 views)
    2. mark08054's Avatar
    mark08054 Posts: 8, Reputation: 1
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    #10

    Feb 27, 2010, 08:32 AM

    OK Im back. Still same problem. One thing I didn't see last time. A little water under the blower for the flue pipe. And I notice this problem when we get a lot of snow, N.east could the moisture be doing this?
    mark08054's Avatar
    mark08054 Posts: 8, Reputation: 1
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    #11

    Feb 27, 2010, 08:43 AM
    York diamond 90 model P3UR runs for 30 sec. and stops
    I have a york diamond 90 model P3UR
    When I raise the temp, the blower goes on, then I see the pilot get hot ( glow ), then blower goes on for about 30 seconds and shuts off. This goes for 3 cycles then stops. Tried cleaning the flame sensor... still does the same thing Can anyone help? Thanks I noticed a lottle water under the blower motor for the flue. Seems like I get this problem when its snowing. Could this be the problem?
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