I have a trane furnace xe90, model TUY080R9V3A1, serial number K504W507Gi. When I turn the power to the furnace on I get the 5 flashing code, flame present when there is no flame. Now sometimes I turn on the furnace and it will heat up the house, but once it get to temp. the inducer fan will stay running and when it calls for more heat the blower will turn on but no heat will come on. Then I turn the power off to the furnace, try to turn it back on and it "clicks" once like it's trying to ignite but nothing happens. I hope there is someone on here that can help me. Thank you.

Check the wire from the control to the flame sensor rod. If you find any problem, replacement is in order. Most likely the problem is in the control itself.