Ihave a furnace it has a 50a50 241 control on it. From t- stat call for heat gas valve opens burners start 10 seconds later gas valve closes, now I have cleaned the flame sensor and it's a year old, Another thing I noticed is I get no red led light fromm the module their no light comes on to let me know the error now I do under stand it not sensing flam to keep the gas valve open could something be wrong with the module how to troubleshoot that one.

What kind of unit do you have