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    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #21

    Dec 21, 2008, 10:42 AM

    Sorry, I remember now that you replaced this. So many threads, so little memory... you were getting 28v at gas valve during ignition trials but no click from valve? Is valve switch on?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #22

    Dec 21, 2008, 10:45 AM

    What are the terminal designations on the gas valve - "TH" & "TR", or "P", "C", & "M"? If the latter is true, is there a jumper between "P" & "M"?
    razorface's Avatar
    razorface Posts: 14, Reputation: 1
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    #23

    Dec 21, 2008, 11:22 AM

    It is M and C and there is no jumper between m and p as p is blank
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #24

    Dec 21, 2008, 11:30 AM

    Okay, try this: set voltmeter to AC amps function (make sure probes are connected to the right inputs), attach one probe to "M" terminal and one to wire removed from "M" terminal. Now turn heat on and see if you measure any amperage during ignition trial (when you hear click from gas valve relay on circuit board). If you do but hear no click from gas valve, the valve is bad, likely stuck closed.
    razorface's Avatar
    razorface Posts: 14, Reputation: 1
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    #25

    Dec 21, 2008, 11:31 AM

    No click at the gas valve the switch is on
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #26

    Dec 21, 2008, 01:17 PM

    Did you measure any amperage?
    razorface's Avatar
    razorface Posts: 14, Reputation: 1
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    #27

    Dec 21, 2008, 06:07 PM

    KC13 and wmproop you guys did a lot to help me out and I greatly appreciate it. My problem was the als and now it is working and my house is now warm. Thank you!
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #28

    Dec 24, 2008, 11:13 PM

    Continuity test,, the wireing on each end . Pull the wires loose from each limit switch and use the same tester to see if they are open
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #29

    Dec 24, 2008, 11:17 PM

    razorface agrees: this post is better than the gospel

    Sorry to disagree,, nothing is better than the gospel
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