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Ruud Achiever 90 - Intermittent - No ignition sometimes, ignites other times and turns off after a short while, lastly can get to ignite and stay on also using technique below. Seems to work fine IF I open cover door and let more oxygen in and leave cover slightly open. When cover door if fully closed it has harder time igniting, does not ignite at all, or ignites then goes out shortly thereafter. Need to recycle power to get furnace to go through the start up process. Think perhaps need to clean flame sensor after doing some reading but I am now letting it run to get the house heated up again before I try anything . Just wondering if the fact that it ignites better with cover door slightly open supports the flame sensor theory or ???

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  • VIPGNC Mar 27, 2011

    I have a single vent pipe... was planning on making sure there was no blockage but unit seems to be venting OK. Wondering if increased air causes flame to burn hotter (perhaps less efficient) and this is overcoming any build-up on flame sensor. The furnace has been running fine over the last hour or so once i got it started and I am leaving the cover door cracked a little to increase the air flow or reduce the vacuum created inside the unit when the flame is ignited and fans running. Perhaps the increased air (reduced vaccum) inside the ignition chamber is not the main reason why it is working for now but want to get my house temperature back into the 70's before I mess with it anymore.

  • VIPGNC Mar 27, 2011

    have a single vent pipe... was planning on making sure there was no blockage but unit seems to be venting OK. Wondering if increased air causes flame to burn hotter (perhaps less efficient) and this is overcoming any build-up on flame sensor. The furnace has been running fine over the last hour or so once i got it started and I am leaving the cover door cracked a little to increase the air flow or reduce the vacuum created inside the unit when the flame is ignited and fans running. Perhaps the increased air (reduced vaccum) inside the ignition chamber is not the main reason why it is working for now but want to get my house temperature back into the 70's before I mess with it anymore.

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No it shouldnt have anything to do with the cover, tighten all bolts, grounds, screws that you can find. Find the flame sensor and try cleaning it and also make sure sensor in inside the flame. let me know.

Posted on Mar 27, 2011

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  • VIPGNC Mar 27, 2011

    Thanks... problem started yesterday and furnace did not run all night so I am letting it heat the house up before I do any troubleshooting/work on it. Just found it interesting that allowing more air into the ignition section of furnace seemed to help assure ignition. There is also a punchout (hole) in the side of the unit, while I only tried this once (as I want it to keep running to heat house) when I covered it with my hand thereby blocking the air that was being drawn into the unit through the hole the flame went out immediately! This too seemed to indicate that whatever the issue was the restriction or addition of air from outside the unit seemed to have an impact on the ability of the flame to ignite or stay lit. Will let house get heated... look to clean flame sensor... and post followup later in the day. Any other suggestions would be appreciated. Thanks.

  • Walter Kunesky
    Walter Kunesky Mar 27, 2011

    do you have a one pipe system or a two pipe system.

  • Walter Kunesky
    Walter Kunesky Mar 27, 2011

    Hi, do you have a pressure switch on unit? this would be a rubber line going from the draft inducer motor to the pressure switch. do you have a way of checking this switch, if not jump the two wires together and see if unit stays running, if the draft inducer motor was going bad, opening the door would allow the load to go down and it blow enought air to keep switch open. Let me know.

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