It's freezing and I don't have heat. My York 80 furnace fires up and runs for approximately 2 minutes. The small exhaust fan runs but the large blower fan fails to start. I'm able to turn the blower freely by hand. I have an error code flashing on the White-Rodgers 50A50-241 board. The red LED light flashes 4 times, then pause, then 4 times again and so on. I've read possible failure of capacitor or high limit switch. What is my next course of action? Thanks.

I am renting a house and am having an issue with the furnace. Want to see if it is a simple fix before I contact my landlord about coming to look at it. When the thermostat is calling for heat it comes on ok for maybe a minute and then the motor begins clicking on and off for the entire time it is trying to heat. From inside the house I can't hear anything happening, but noticed the outside vent chugging on and off so I went to the basement to see what it was doing, and while it is clicking on and off the flame is starting and stopping also. The furnace is vented through a pipe and comes through a wall on the side of the house. Every time this clicking is happening, the exhaust from the vent pipe is stopping and starting. I had the furnace cleaned about 1.5 months ago, nozzle changed, and whatever else a service tech would do during a cleaning. This problem has only happened with the furnace since that time, last year it did not do that at all. The problem started intermittently only doing this sometimes, but now it is doing it every time the furnace runs. There is heat blowing from the vents during heating without a problem. I have now turned off the emergency shut off and am running some elctric heaters to keep the house warm, but they're not doing much as it is currently minus 20 here. Any thoughts on what the problem could be?