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It's hard to answer your question without the age and brand of your heater but the blinking of the red light can be a heartbeat, which indicates all systems are ok and there is power or the blinking is like 2 blinks, pause, and 2 blinks, pause repeating. That would indicate a failure code. In that case Google the model and serial number to get the failure code.
IF YOU LOST POWER WHEN FURNACE WAS RUNNING IT TRIPPED ROLLOUT SWITCHES AND POSSIBLY THE HIGH LIMIT . IN CENTER OF ROLLOUT SWITCHES IS A LITTLE RED BUTTON THAT YOU RESET . YOU CAN ALSO TRY FINDING HIGH LIMIT WITH POWER SHUT OFF TO FURNACE PULL BOTH WIRES OFF HIGH LIMIT AND USE PAPER CLIP TO JUMP BETWEEN THE TWO WIRES MAKE SURE YOU DONT SHORT OUT AGAINST ANY METAL WHEN YOU TURN BACK ON IF IT WORKS YOU NEED A NEW HIGH LIMIT SWITCH.
Number of flashes mean different things for diff models. The meanings of those flashes should be posted somewhere on the unit; usually inside front of the bottom service panel. Though you can't truly diagnose a problem by number of flashes they can give you an idea of where to look for a problem. There are a ton of videos and how-to's about furnaces on youtube by real service techs. Most modern furnaces have basically the same set-up and features so don't worry about your paticular brand; but of course that would be the best place to start looking. You could start here to familiarize yourself with your brand of furnace:
In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.
Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.
shut power off at SSY switch,which is on side of furnace, and wait 5 or 10 minutes and turn it back on. watch the red light and see how many times it blinks. On the inside of the lower door, is a diagnosis for the red light blinking. it is probably your flame sensor. If you can take it out, clean it with a dollar bill and reinstall it and it should work.
the high limit is sensing the internal temprature of the furnace.If your filter is very dirty or you have to many of the registers/dampers shut it will cause the temp. of the furnace to exceed its rating and the high limit will open the circuit and shut down the flow of gas. Your blower will then run until the furnace has cooled and the switch will close and allow it to come back on. This is bad for your furnace, make sure your filter is clean and you dont have to many registers shut. If you have run the unit without a filter the problem could be much more sever requiring blower wheel and coil cleaning and possibly a cracked heat exchanger.
Defective combustion air switch. The 3 blinks are an error code. You didn't say, but I'm guessing you have a Coleman Evcon. They had alot of defective Combustion air switches. Your specialists were not that.
A constant red light (not blinking) indicates that the thermostat is not calling for heat. Of course you know it is but just to be safe, jump out R and W on the board. If it continues to do the same as you indicated, replace the board.