A friend recommended that a friend's wall-hung boiler needs maintenance.

Write according to the following steps:

1, briefly explain the problem, such as: "I am XXX, recommended by my friend to come to your company. Can you help me solve the problem of wall-hung boiler maintenance? "

2. Describe the problems of the wall-hung boiler in detail, such as which functions can't work normally, what abnormal situations have occurred, and so on. Provide as much information as possible, so that maintenance engineers can judge and handle it better.

3. Ask the maintenance company for information or documents, and provide your own contact information, so that the maintenance company can further communicate with you.