Greetings.  So not sure how I did this but I forgot to close my ash door and cycled through my wood load.  Glad my boiler is in the garage because it filled the room with smoke, and ash.  Thankfully I did not register an overheat warnings on the RK2001U controller.  Or burn my house down.  But now the fan will not come on when I have a fire.  When the system is cold I can start, and stop, the fan manually but not when I have a fire.  I've tried turning it on when the system is in the 140s with no luck (max temp set at 175).  Any ideas would really be appreciated.  Thanks.