Hello. I have such a question, is it possible that the water will boil in the CO boiler due to some fault of the fan (mounted on the stove). A stove with a controller, without a feeder, for fine coal and coal. I have two houses and recently moved the fan to the second stove. On that recently there was a problem with the boiling water. We were looking for the cause. After moving the fan, this problem occurred in the second furnace. The fan was recently purchased. I have set on the controller that at 55 degrees the fan should turn off. And it kind of turns off, you can't hear the work. But the temperature goes up to 90 degrees. Could it be the fan's fault? The same is true for two stoves ... it gives food for thought.