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    jb2297's Avatar
    jb2297 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Feb 5, 2009, 06:20 PM
    Gas furnace
    Why,when I set my thermostat at 72 the furnace won't heat past 66-68.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 5, 2009, 07:10 PM
    Could be the thermostat
    Could be the furnace
    Try disconnecting the R and W wires at the furnace and using a wire jumper the R and W connections. If after doing that the furnace heats the house past the 66-68 degree lever you have a thermostat problem if not and the furnace will not heat past the 66-68 level then you have a furnace problem.
    jb2297's Avatar
    jb2297 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Feb 5, 2009, 07:28 PM
    Quote Originally Posted by hvac1000 View Post
    Could be the thermostat
    Could be the furnace
    Try disconnecting the R and W wires at the furnace and using a wire jumper the R and W connections. If after doing that the furnace heats the house past the 66-68 degree lever you have a thermostat problem if not and the furnace will not heat past the 66-68 level then you have a furnace problem.
    I just installed a new thermostat.What may be the furnace problem
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
    Senior Member
    		  
    #4

    Feb 5, 2009, 07:30 PM

    What's your filter look like?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Feb 5, 2009, 09:00 PM
    Did you do all the settings correctly if it is a new digital thermostat?
    As mentioned by MarkwithaK a dirty air filter,dirty A/C evaporator coil, or closed registers/restricted return airs will have a big effect on proper furnace operation.
    Naturally an improperly operating furnace with out of range sensors and other defective controls can also cause this kind of problem.
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