ALL i get is the fan motor blowing nothing else code 33 i check the 2 resetable limit switch with the red wires for a open both were fine when i remove 1 of the thermistat wire off the control board the code will clear and then place wire back on with power the inducder will start and heater will go threw it's normal cycle till it call 4 gas then i get the code 34 and the inginator will light 2 times before going on lockup bad board? can that cause a code 33? as the heater say's limit switch but obvious the board feed the limit switch