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

    May 21, 2007, 11:27 AM
    Honeywell rth6300B heating won't come on
    I've wired in a new honeywell rth6300b that's controlling gas heating with air conditioning. I'm confident that the wiring is correct as I followed the installation instructions, but when I set the system to AUTO HEAT and set a high temperature, it makes a loud click but doesn't fire up. If I do the same for AUTO COOL it works fine and the a/c comes on like it should do. Any help or advice would be most gratefully received. James
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #2

    May 21, 2007, 04:08 PM
    Sounds like the furnace is broken and not the thermostat.
    See the FAQ at the top of the main HVAC page for a little more help on what kind of furnace you have and how it should operate.
    jameswiltshire's Avatar
    jameswiltshire Posts: 2, Reputation: 1
    New Member
    		  
    #3

    May 21, 2007, 07:22 PM
    Thanks for the suggestion Northern Heat. The thing is the furnace will fire and the heat will come on if I switch over to HEAT ON, the problem is when the unit is set to AUTO HEAT; it doesn't fire under that setting. Any further suggestions? James
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