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1. First check whether there is electricity and whether the fuse is burned. If the fuse is blown, it is necessary to check.
2. Secondly, check whether the motor stator is hot. If it is too hot, it means that the motor cannot be switched on and off during thermal maintenance. If it is not hot, check whether the starting capacitor is invalid. The road gate manufacturers remind us that this type of fault is nothing more than these two, so it is easy to distinguish!
3. Whether the motor contact is good. If we cannot switch normally, we need to measure whether the signal line is short-circuited. Because it is sensed by the limit sensor, if the two sensors are short-circuited at the same time, it is equivalent to opening the door limit.