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I have an American Standard Freedom-80 Two stage furnace/AC. After replacing my old Honeywell with a new Honeywell RTH2310 thermostat (which the guy from A-1 Heating & A/C assured me was compatible with my system) the A/C won't kick on. The thermostat is registering the ambient temp & when I turn the thermostat fan switch to ''on'', the fan turns on, but not with cold air. I have not even tried the heat because it was 89 degrees F inside already, but would expect the same issue. The metal door on the furnace has a peephole, through which I can see a blinking red light. Should that light be solid red, or is it supposed to be blinking? Is it likely that I just need to re-check the wiring connections on the thermostat? Or was the A-1 guy incorrect about the compatibility of the thermostat? Thanks, Amanda

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  • aef222 May 02, 2010

    Yes, I failed to mention that of course I do have the thermostat set to the "cool" position...
    The blinking light is on the actual furnace, not the thermostat and when I take the cover off, the only information I see near or pertaining to the blinking red light is "DS1", which means nothing to me.

  • aef222 May 02, 2010

    Would the normal situation be for the light to be solid red, or off, or does it depend on the furnace?

  • Brian Niten May 11, 2010

    If you put the fan switch in "on" only the fan will come on. It is a manual control for the fan. You have to put it in cool to get the A/C to work. Have you tried that? Also if you look at the owners manual or remove the cover with the peep hole so you can see the circuit board it should say what the blinking light means whether it is an error code or normal.

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If your system worked prior to installing the new thermostat, then you may have to change how your thermostat is wired in the rear, as I encountered the exact same problem in that regard. Beyond that, if you have a blinking light, chances are it may be a problem with the furnace itself. After you are confident the thermostat is wired properly, if you still get a flashing light, then you have an internal problem with the furnace and will have to get a repairman out to investigate the code given by the flashing light.

Posted on Jun 08, 2010

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The DS1 probably means dip switch 1. The light is used to give you different trouble codes. There should be something printed on the circuit board or on a label nearby that lets you know what each series of blinks means. I agree a good place to start would be to recheck the wiring then make sure you have the program in the thermostat right. It has several options.

Posted on May 02, 2010

  • Brian Niten May 02, 2010

    I think blinking would be normal.

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