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.
Testimonial: "Awood 8531-1v-DCLP I posted this before but for some reason it does not post."
SOURCE: Thermostat calling for heat but furnace shuts off and on
I had to fix a similar furnace recently I cut 2 cm off the end of a hose and made it tighter I tapped the relay on the circuit board in case it arced and spot welded itself shut All worked fine right afterwards
Testimonial: "i could try shortening the tube but it seems short enough. I don't understand the second part of your solution. I've never dealt with circuit boards/furnaces before"
SOURCE: Furnace blower won't turn on
You may need to replace the sail switch. It senses the fan speed and when it connects the gas valve should open and furnace should fire up.
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