1, the inside of the warm air water tank is blocked, and the coolant circulation is not smooth, that is, the heat in the water tank is insufficient, and there is no heat when the wind blows.
2. If there is a warm air water valve, check whether the water valve is fully open, even if the water flow is small.
3. Another problem is that the hot and cold mixing damper inside the warm air box is not in place, resulting in too little hot air.
4. Touch the two warm air pipes with your hands to see if the temperature is enough, which is different, and judge whether it is a water tank problem or a valve problem.