Question about Heating & Cooling
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
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
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Posted on Jan 02, 2017
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Hi, Basic Furnace or Heating System Troubleshooting
Check on the inside of the bottom cover to see what the two blinks means
Here is a tip that will help you try to figure out why your furnace is not working.
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