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    tech528's Avatar
    tech528 Posts: 1, Reputation: 1
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    #1

    Feb 18, 2009, 06:56 PM
    Limit switch on gas furnace
    Fraser johnson intermittingly kicking high limit switch,code flashes 4 times on board,it never has any other codes,replaced limit switch,still same problem
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Feb 18, 2009, 08:12 PM
    Something is causing the unit to overheat. Check the air filter, replace if clogged. Is the blower running correctly? If the system has air conditioning, is the evaporator clogged? Is the gas input too high? These are the most likely culprits. Chances are, the old limit wasn't bad, just doing its job.
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