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    xavia9's Avatar
    xavia9 Posts: 1, Reputation: 1
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    #1

    Nov 21, 2009, 09:44 AM
    Rpm motor out of range
    Have a carrier weather master and am getting the error message that my rpm motor is out of range.. the heater works if I have it set in emergency mode..
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Nov 21, 2009, 10:36 AM
    Airflow restriction can produce this fault. Check air filter and, if possible, air conditioning coil (if present) for blockage.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #3

    Nov 21, 2009, 10:42 AM

    What would change the fault by putting it to emg heat? I agree must be a airflow problem!
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #4

    Nov 21, 2009, 10:45 AM
    Quote Originally Posted by Joshdta View Post
    what would change the fault by putting it to emg heat? I agree must be a airflow problem!
    The emergency mode selection (DIP switch on circuit board) defaults the unit to maximum values for requested blower & inducer CFM/RPM . This is usually effective as a short-term solution when a secondary HX is restricted.
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