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    mikehuard's Avatar
    mikehuard Posts: 2, Reputation: 1
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    #1

    Dec 30, 2013, 05:33 PM
    Rheem Classic 90 Plus intermittent cycle
    I have a Rheem Classic 90 gas furnace. Lately I have noticed that when heat is required, the furnace turns on normally but shut down after 10 minutes prior to reaching the required temperature. Within a minute the cycle starts all over again and shuts down after 10 minutes.

    I have noticed that when operating normally the 3 led lights are on (yellow, green and green). Then the yellow led turns off and the next led (green) flashes in sequences of 3 times, pause, 3 times pause...

    What do you think is wrong and can you tell me if I can fix it?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Dec 31, 2013, 06:54 PM
    Somewhere on the furnace, usually inside the blower compartment door or on the board itself is a key to the blink code. If you can find it, please tell us the meaning of a 3 code.
    mikehuard's Avatar
    mikehuard Posts: 2, Reputation: 1
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    #3

    Jan 1, 2014, 05:22 PM
    Hi Mr. White,

    It says 3 blips equals the limit switch is open.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #4

    Jan 1, 2014, 06:06 PM
    It could be a faulty limit switch but not likely. The most probable causes are: dirty or highly restrictive air filter, closed or blocked vents (either supply or return), dirty blower wheel, dirty A/C coil (if you have A/C connected to the furnace). There are some common problems listed, more or less, in order of easy to cure.
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