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New Gas valve receiving 24v wont open 2

170
170 Member Posts: 1
in Gas Heating
I'm having the same problem. I have the volts but not the amps. Had a bad valve last April and replaced the board as well as I did not want to buy a new furnace. I saved the old board and will put it back in. I do not like the new board as it was programmed by lawyers to blow the furnace clean before ignition-too much suspense.

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,848
    I have no idea what you are talking about
    HomerJSmith
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,644
    Ummm, hmmm. Lawyers and control boards....24 volts but no amps? Hmmmm
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
  • HomerJSmith
    HomerJSmith Member Posts: 2,635
    edited October 2023
    It is probably wired up wrong, check the wiring. How do you know there is 24 Vac at the gas valve?
    Pre-purge of the combustion chamber is good. Pre-purge has more to do with the control board than the gas valve.

    Is this a boiler or a furnace? Some people don't know the difference.

    There is a whole line of safety switches before the gas valve any of which will shut down the gas valve if they don't close.
  • Big Ed_4
    Big Ed_4 Member Posts: 3,076
    Never post during happy hour ....

    There was an error rendering this rich post.

  • HomerJSmith
    HomerJSmith Member Posts: 2,635
    O.K. guys give the guy a break. Were here to help. You know Heating Help.com.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,718
    I looked at his previous post where he asked about this problem last year. I sort of remember this one...

    But there was no previous Discussion?!?

    I would like to add what I would say to my apprentice technicians every time they condemned an expensive part (or something that needed an expensive repair):

    “After you replace that part and it does the same thing, what will you check next?”
    Sometimes the answer was as simple as “The Fuse”
    I would tell them to check the fuse first.

    So @170 Describe your conditions:
    What brand and model number heater do you have? With that we can look up the sequence of operation and see where the failure is happening.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • realliveplumber
    realliveplumber Member Posts: 354
    Was the thread merged from somewhere else?
  • HVACNUT
    HVACNUT Member Posts: 6,456
    Is it a 2 stage gas valve (3 wires) but wired for single stage only? 
    Often stage 1 will go through an auxiliary limit in the blower compartment. If the limit is open, then obviously no fire even though there's 24 volts to the stage 2 terminal at the valve. 

    It wasn't lawyers who programmed pre purge into the circuit board? It was smart people. 

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