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Ruud achiever 90 plus furnace will not start with door on.

I have a ruud achiever 90 plus. The furnace will not ignite, however it will ignite if the furnace cover is off. The system tries to start and shuts down. I take the cover off, the system starts up and ignites. When it does not start with the door on I get a green light blinking twice. I can not figure this one out. Thanks for any advise.

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I would try to check your return air first, making sure there is no blockage and that your air filters are clean. It almost sounds like when you take the cover off, you are pulling enough air into the system for it to run, but as soon as you close it off, it's not getting enough air flow, therefore, tripping a limit switch inside the furnace. Most furnaces will also have the codes for the flashing lights and what they mean on the inside of the door covers.

Posted on Feb 03, 2010

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