What is the reason why the air conditioning display screen of constant temperature mushroom room shows that the fan is in manual mode?

One of the most common reasons for fan problems is poor contact, which is not a big problem and can be solved by yourself in daily life. The best way is to measure the main switch with a multimeter to see if the resistance is normal. If the resistance is too large or too small, problems will occur. If it is a resistance problem, you can directly repair it or replace it with a suitable resistance. 2. There is another reason for the fan problem: the screw at the joint between the motor and the fan blade inside the air conditioner is loose.