Hello. Bought a Master Forge propane smoker at Lowes. It has the double doors (1 door for the smoke box over the second door for the burner). Problem is I cant get the temp to go above 225 degrees. Smoking boston butts for the second time this morning and as did the first time the temp wont come up. Burner flame looks good and getting plenty of smoke, just that the temp guage on front of smoke door only reads 225 max. Any suggestions??