Fault check: the first car, when the water temperature rose to 90 degrees, open the warm air switch, the outlet out of the cold, the computer query 08 automatic air conditioning control section unit, do the implementation of components, all normal, can certainly not wind plate motor hit Open, continue to check, the warm water inlet pipe and return pipe, found that the water pipe is particularly hot, return pipe and the water pipe temperature difference is large, which concluded that the warm water tank has blocked the phenomenon, the customer agreed to replace the heater After troubleshooting.
     Analysis: warm water tank is composed of a number of water pipes, in order to increase the cycle, in each small water pipe to install a spiral cylinder, due to damage to the spiral cylinder will be warm feng shui blocked, resulting in no warm air.