Have you done the basics? You need fuel ... and electricity to make this device operate. You say the light blinks three times... I guess you have electricity. What about fuel? Do you have? Is it on? Can it get to the burner (filter issue)? Control have electricity?
Next you have to have an 'order' for the device to come on ... are you calling for heat through the thermostat? Is this a forced air device or hot water base board device or other type???
I would check for a reset button somewhere on the device ... press it. If no results, I believe I would turn the power off to the device ... wait for a minute and turn it back on. Try again. If you are in the USA, there should be a emergency shutoff switch near by, probably red in color. If not ... you may have to go to your power panel to find a way to secure power to the device.
This is general information I offer to you to help you solve your own problem. It is hard to go much further ... you don't say anything about the make or model of your furnace (your question is listed in the Air Conditioner section, by the way) nor the kind of fuel you use.
One more suggestion ... have you googled the make and model of your burner for trouble shooting suggestions? If you have a light that blinks three times, my thought might be that there is a logic circuit on your burner that is telling you the answer to the problem. If you can find your manufacturers website troube shooting section, there is very likely a chart there that tells you exactly what three blinks mean.
One more final suggestion ... Repair may be beyond your ability, your fuel supplier has vested interest in your well being, you can always call them for assistance in the repair department for your device.
Thank you for your interest in FixYa.com
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