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    aterbrys0528's Avatar
    aterbrys0528 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    May 24, 2007, 07:30 AM
    New thermostat.neither A/C or furnace works.
    OK, so I went to go turn on the central air for the first time this summer and I saw a spark inside the thermostat and what do you know... the A/C won't turn on, and neither will the Heat. I replaced the old (and I mean OLD) thermostat with a new programmable one, and still nothing works. I KNOW I wired the new thermostat correctly. It's a 4 wire heating/cooling set-up... I was told maybe the transformer went out in the furnace, so I broke out the multimeter and I still got 24V on the secondary side of the transformer... any ideas??
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 24, 2007, 08:43 AM
    Trace the 24 volts until you find where the problem is.
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