I have a Propane furnace model # KG6RC-060C-12A. The furnace fires up but shuts off after a few seconds. It attempts this 3 times and then shuts off. The code light is blinking 4 times. I checked the wiring for loose grounds and it appears to be OK. The unit is only 3 years old. Any suggestions on what it could be or how I should proceed?

I have a Propane furnace model # KG6RC-060C-12A. The furnace fires up but shuts off after a few seconds. It attempts this 3 times and then shuts off. The light is blinking 4 times. I checked the wiring for loose grounds and it appears to be OK. The unit is only 3 years old. Any suggestions on what it could be or how I should proceed?

Try cleaning the flame sensor with fine sandpaper or steel wool.

Red light
On = Power
1 Flash = Limit Circuit Open or External Load on "W"
2 Flashes = Pressure Switch is Open with Inducer ON
3 Flashes = Pressure Switch is Closed with Inducer OFF
4 Ignition Failure( Check ground)
Continuous blink= False Flame or Gas Valve Relay Shorted

Yellow Light
On= Flame Present
Continuous flash= Low Flame Sensor Signal