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Thread: Armstrong Ultra II 97

  1. #1

    Default Armstrong Ultra II 97

    May furnace won't ignite. I tap on the Robertshaw Model SP735A Ignitor and the system starts. Does anyone know if the Robertshaw ignitor develops poor soldering joints. I do plan on removing it and examing it or is there something else I should check?
    Thank you in advance for any help,
    Jammon

  2. #2
    Join Date
    Oct 2006
    Location
    Redlands, California
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    789

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    Do you tap on the actual ignitor, or the ignitor contol box? If it's just the ignitor, I would pull it off and see if you can cleasn it up. You might have a bad ground and it's not able to get a good spark. If it's the control box, it's solid state board. I would just replace it.

  3. #3

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    I tap on the Robertshaw ignitor control module, not the ignitor.

  4. #4

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    Quote Originally Posted by sloooo View Post
    Do you tap on the actual ignitor, or the ignitor contol box? If it's just the ignitor, I would pull it off and see if you can cleasn it up. You might have a bad ground and it's not able to get a good spark. If it's the control box, it's solid state board. I would just replace it.
    Thank you, but do you know if the module develops bad soldering connections. I have to reset first it, then I tap it and it starts working. I have all the tools to fix a solid state device. Have you had any success with repairing the module?
    Jammon

  5. #5
    Join Date
    Oct 2006
    Location
    Redlands, California
    Posts
    789

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    It might be a sticking relay. You can take it apart and see if you find anything. If I was at a job, it's just cheaper to replace it. To pay me by the hour to pull the module apart and try to fix it is to costly. You can get a new module for a little over a hundred bucks, so being a service tech, I would just change it.

  6. #6

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    Quote Originally Posted by sloooo View Post
    It might be a sticking relay. You can take it apart and see if you find anything. If I was at a job, it's just cheaper to replace it. To pay me by the hour to pull the module apart and try to fix it is to costly. You can get a new module for a little over a hundred bucks, so being a service tech, I would just change it.
    Thanks,

    I have removed the module and did not find any bad soldering joints. I currently can start the system by turning off the system, wait 30 seconds and the system runs. Don't think it's a relay now, will replace module.
    Thank you for help,
    Jammon

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