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Thread: Rheem 04EAUSR. Igniter doesn't glow.

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    DIY Junior Member Rickcusaf's Avatar
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    Default Rheem 04EAUSR. Igniter doesn't glow.

    I have a Rheem 04EAUSR and when I turn it on and set it to call for heat, the unit starts up and blows air, but it's not hot. When I went to the garage to look at it, the flame wasn't on. I went through the quick check guide on under the panel and after following the steps I've found out that my igniter doesn't glow at all. What is the next step I should take to diagnose the problem?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    That could be a symptom of the control board, or the ignitor, or a wiring failure (assuming it had worked). Look for obvious things like a loose or corroded, or broken wire to the ignitor. Watch the thing through a full cycle to verify it never gets hot. It doesn't stay hot once the system determines it has actually lit the burner. On some, the ignitor is also the flame detector. If it does get hot, when the gas should then come on, if it doesn't detect that it actually got hot because of the flame, rather than applying electricity to make it glow, it will shut the gas off. So, if it does come on, it could be the gas valve is not opening. This again, could be the valve or the controller. If you are comfortable with a meter, you can verify that the parts are getting their proper voltages at the proper time. Also, if this is a closed combustion device, the fan may not have come on and the vacuum switch interlock may be preventing it from going through the proper cycle since it is sensing some problem with the flue.
    Jim DeBruycker
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    DIY Junior Member Rickcusaf's Avatar
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    I ended up replacing the ignitor based on what a local HVAC guy said. It still didn't glow, but when I turned it on this time, the gas started going and didn't shut off. I ended up turning off and unplugging the unit, because the whole house started to smell like gas.

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    Jack of all trades DonL's Avatar
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    Quote Originally Posted by Rickcusaf View Post
    I ended up replacing the ignitor based on what a local HVAC guy said. It still didn't glow, but when I turned it on this time, the gas started going and didn't shut off. I ended up turning off and unplugging the unit, because the whole house started to smell like gas.
    That is not good at All, I would check the CAD eye.

    Gas is no playing mater...
    Theory only works perfect in a vacuum.

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    DIY Junior Member Rickcusaf's Avatar
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    Where would that be located so I can check it? I did some searching and only found stuff about Oil burners?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Different makes use different methods to determine if the flame has actually ignited. Sometimes it's a little probe, sometimes it's the dual purpose ignitor/sensor, sometimes it's a photo sensor. Somewhere in your documentation it will have a theory of operation, and describe what you have. Then, either in that manual or on the block diagram often on an inside panel, it will show the interlock, and operational wiring diagram. Unless you deal with wiring diagrams often, they can be confusing, but if you take your time, you can usually figure it out. Whatever your system uses, it must either be in the flame or be able to see the flame.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    General Engineering Contractor ballvalve's Avatar
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    Quote Originally Posted by Rickcusaf View Post
    I ended up replacing the ignitor based on what a local HVAC guy said. It still didn't glow, but when I turned it on this time, the gas started going and didn't shut off. I ended up turning off and unplugging the unit, because the whole house started to smell like gas.
    You are definitely going to spring for the HVAC guy, or up your homeowners insurance and take a long vacation.

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    Jack of all trades DonL's Avatar
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    Quote Originally Posted by ballvalve View Post
    You are definitely going to spring for the HVAC guy.
    That may not be a bad Idea.

    After looking at the service manual for that unit, It looks like it could be a Air Flow sensor, Shutting it down.

    If the old ignitor was bad, and broke and shorted to ground, It may have blown the fuse.

    The three LEDs on the control board should help to troubleshoot the simple problems.

    A service tech may be worth the cost, For safety reasons.
    Theory only works perfect in a vacuum.

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    General Engineering Contractor ballvalve's Avatar
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    a bad air flow sensor will NEVER let gas flow. Just changed a few. Probably the main board. VERY rare for gas to flow with a igniter hot and the exhaust inducer running. Only chance would be a out of alignment hot igniter, and bad flame sensor.

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