Hi, I have a 6 year old york furnace that doesn't seem to be working anymore. The burner turns on for 20 sec each time up to 3 times then goes out. I took out the ignition sensor and cleaned but doesn't seem to work.

When I look at the error code, it gives me 6 flash lights. Any Help would be appreciated.

Thank You.

Check the error codes on the back of the panel. That should help you. Might be a pressure switch, clogged vent tube, induced draft fan not working.

All the fans tend to work, it goes through a proper process, the pilot comes on, the flame comes and goes out after about 30 sec.The panel does say it's related to a pressure switch. Are there any diagnostics I can do before calling in and save $$$?

Ohm out the pressure switch to see if it's functioning properly while the fan is on. Also take the hose off the pressure switch to see if there is a blockage by blowing in it. Sometimes dust and debri can clog the hose.