If multiple ETX/ETSX tanks are installed in the system, check pressure of each for possible air leaks. Be sure air valve caps are on tight.

• 如果在系统上安装了多个ETX/ETSX膨胀罐，则检查每个膨胀罐，看看是否有气体泄漏。确保塑料气体阀门盖是否拧紧。