I have had mine in Room Temp mode for Two Years. Never experienced the continual High and Off your having a problem with. I usually have the Dial set to around 1/3rd to Half around. Feed Rate at 3 1/2 and I adjust the Temp Between 72 and 75. . My prob sensor is halfway round the room. I have had it shut off when that Probe is too close to the stove, heats up quicker and shuts off. Running right now and is keeping a steady blow, not high, and Room temp is now at 78. Stove set for 72.