I'm going to write about this again. Our was doing the same thing - it was either on or off, blowing warm air or not blowing at all. A tech came out, took the fireplace apart to work on the thermostat, couldn't find a thermostat, put it back together not fixed. Another tech came out, took it apart, verified there was no actual thermostat but that there should be one. Came out another time with a thermostat, installed it, put the fireplace back together, and the thermostat knob now actually works like a thermostat, that is, you turn the knob until the blower turns on, then it cycles off and on according to the setting. Anyone else look for that? Lorna