With it getting cold out, the furnace in my rental unit starting malfunctioning. It would cycle on, burn for about 5-10 seconds and then cycle back off. Typically when this happens the flame sensor is dirty and is causing the furnace to cycle on/off. The reason this happens is when the flame sensor is dirty it does not property detect that the furnace is on. It then sends a notice back to the furnace motherboard reporting that the furnace is not on. This causes the motherboard to cycle the furnace to try and “turn it on” which in turn causes the never ending power cycle loop.
Link too Good video explaining how to clean a furnace flame sensor.