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  1. #1

    Furnance kicked my rookie butt today

    Guys I need some opinions this am. Working on a Tempstar NUG5075BFA2. It has a VR8204M1075 gas valve. The t-stat calls for heat, inducer goes and closes the pressure switch. They the direct spark ignightor starts sparking and there is a poof of gas that comes from the piliot tube that imd goes out. The gas valve is getting 24v on the red wire and 12v on the black. Do you guys think the valv is bad? This is the first one wire spark ignition system I have seen.

  2. #2
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,400
    Quote Originally Posted by Dwarren2012 View Post
    Guys I need some opinions this am. Working on a Tempstar NUG5075BFA2. It has a VR8204M1075 gas valve. The t-stat calls for heat, inducer goes and closes the pressure switch. They the direct spark ignightor starts sparking and there is a poof of gas that comes from the piliot tube that imd goes out. The gas valve is getting 24v on the red wire and 12v on the black. Do you guys think the valv is bad? This is the first one wire spark ignition system I have seen.
    My first suggestion.

    Stop reading voltages to ground when you really want to read across the coil.

    What was the voltage from red to black on the gas valve?

  3. #3
    Join Date
    Jul 2009
    Location
    st louis mo
    Posts
    334
    you need a new furnace, hive me a call, hurry, hurry, theres only a few thousand left

  4. #4
    Join Date
    Mar 2001
    Location
    Seattle
    Posts
    384
    Does anything prove that there is a pilot flame? Thermocouple?

  5. #5
    Join Date
    Dec 2011
    Location
    Southern Oklahoma
    Posts
    55
    Sometimes a puff of pressure then nothing, will happen when the gas is turned off{residual pressure buildup through an almost closed valve or plug left in by gas company}. When something is kicking your butt it's a good idea to start over and never assume even the simple things. You will be surprised how often it's something really simple...good luck

  6. #6
    Join Date
    Jan 2012
    Location
    Missouri
    Posts
    56
    Did you clean the pilot tube and pilot?

  7. #7
    Join Date
    Sep 2004
    Location
    Jersey
    Posts
    389
    Quote Originally Posted by SuperDave89 View Post
    Did you clean the pilot tube and pilot?
    +1 and clean the orfice.
    Ride hard on a Harley!!

  8. #8
    Join Date
    Jan 2012
    Location
    Missouri
    Posts
    56
    Right some times its the simplest things!

  9. #9
    Join Date
    Jan 2009
    Location
    Fairfield county Connecticuit
    Posts
    778
    LP gas or natural what was your gas pressure in out?

  10. #10
    Join Date
    Dec 2011
    Location
    bedford ind
    Posts
    1,088
    are you using a manometer?

  11. #11
    Join Date
    Jan 2009
    Location
    Fairfield county Connecticuit
    Posts
    778
    I dont think he checked the gas pressure prob lp with no gas in the tank LOL

  12. #12
    Join Date
    Dec 2011
    Location
    bedford ind
    Posts
    1,088
    I've done the same!

  13. #13
    Join Date
    Jul 2009
    Location
    Northern area between Alantic and Pacific
    Posts
    107
    What kind of control board u have? Is it a black box build of Honeywell smart valve? If positive,then check the board first before u condemn the valve. Good luck.

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