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    jlk7322's Avatar
    jlk7322 Posts: 6, Reputation: 1
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    #1

    Nov 25, 2009, 11:52 PM
    Heater and a/c don't not respond to thermostat
    Okay here is the problem. I just moved into a new house but before signing the paperwork, I told them that the a/c and heater does not respond to the thermostat. They said that it needed a new ignitor. So they replaced it and it responded to the thermostat. I flipped it to "ON" and set target temps to 90 and 35, the heater and a/c both kicked on. Then I bought the house but now that its colder, I tried to turn on the heater. I click it to the "on" position on the thermostat and raised the temp to 90degrees. The thermostat clicked but the furnace did not kick on. Same with the A/C set thermostat to target 35degrees and still the furnace does not kick on. What do you think went wrong?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Nov 26, 2009, 12:04 AM

    Is the "ON" position you refer to a heat/cool selection, or a fan selection? Brand/model# of furnace? Status LED present?
    jlk7322's Avatar
    jlk7322 Posts: 6, Reputation: 1
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    #3

    Nov 26, 2009, 12:35 AM
    Fan selection. I do not know the brand/model# of furnace yet or the LED Status? Where do I find the LED status light. My furnace is in the attic.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #4

    Nov 26, 2009, 06:50 AM

    Leave the fan selection on auto. And turn it to heat. Turn the temp up. If it does not come on. Go to the furnace and look at the bottom door for a small flashing light. This will give you the fault of what is wrong with the unit.
    jlk7322's Avatar
    jlk7322 Posts: 6, Reputation: 1
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    #5

    Nov 26, 2009, 07:52 AM
    I checked the furnace, there is no flashing lights. I was staring at the circuit board, in the furnace but did not see any lights.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #6

    Nov 26, 2009, 08:50 AM
    Quote Originally Posted by KC13 View Post
    Brand/model# of furnace?
    This is important... any luck up there?
    jlk7322's Avatar
    jlk7322 Posts: 6, Reputation: 1
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    #7

    Nov 26, 2009, 11:22 PM
    No luck, I see a switch up there, that saids "ON or "OFF" and its on "ON". Is there no power to the furnace if there is no light? I'm a rookie when it comes to electrical.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #8

    Nov 27, 2009, 12:02 AM
    Didn`t see where you said you checked the breaker in power box to see that it was turned on or did you say if it was a gas or electric furnace,, let us know
    jlk7322's Avatar
    jlk7322 Posts: 6, Reputation: 1
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    #9

    Nov 29, 2009, 10:33 PM
    I checked the breaker box and the switch seems to be on. What do you guys think it could be?
    jlk7322's Avatar
    jlk7322 Posts: 6, Reputation: 1
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    #10

    Nov 29, 2009, 11:22 PM
    Nvm, I got it to work now. Turns out the door to the furnace was not securely closed all the way. At first I did not know but after pushing against the furnace door the furnace turned on and now everything is good. Also the safety cutoff switch next to the light switch was also turned off accidentally. Thanks to everyone for their advices.
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