I have a white knight 767c tumble and it keeps blowing cold air. I have pushed the reset button on the back which only fixes it for a short while. Is there anything else I can do????
It is overheating and cutting out... Check the vent outlet is not blocked, try running it with the vent hose free if ok then vent outlet through wall is blocked . Other possibility is the control thermostat is faulty, it is difficult to replace for the amateur as it is between the rear of the drum and the heater plate.