What is the reason why Mitsubishi air conditioner does not start
1. Mitsubishi air conditioning transformer failure or short circuit of external temperature head
If the electric buzzer does not sound, please check the transformer. If the air conditioner shuts down within 10 minutes after starting up, and cannot start, please check whether the indoor tube temperature sensor is open; if it is started after starting, the external fan will not start, check whether the indoor and external temperature heads are short-circuited. Reasons why Mitsubishi air conditioner does not start
Second, Mitsubishi air conditioner voltage is not enough
There are many reasons why the voltage is not enough. I won’t go into details here. If the air conditioner cannot be turned on, it is necessary to check whether the power supply of the external unit has power or whether the voltage reaches the rated voltage. If it is not the cause of the low voltage, please check whether the indoor and outdoor units are connected correctly, whether the wires are aging, and whether the indoor unit motherboard wiring is correct, otherwise replace the internal unit motherboard.
3. Poor contact of Mitsubishi air conditioners or problems with radiators
If the external machine has a voltage of 220V, check whether the red indicator light on the main board of the external machine is on. If the indicator light is off, check whether the connection cable of the external machine is loose. There is a direct voltage of about 300V between the P+ and N- power modules. If not, check the reactor, rectifier bridge and wiring. If there is, but the indicator light of the main board of the external machine is not lit, first check whether the signal connection cable (a total of 10) from the power module to the main board is loose or bad contact, and then no longer, please replace the power module. Be sure to apply thermal paste evenly. (If you don’t understand electricity well, don’t try it easily to avoid unnecessary losses to yourself.) Mitsubishi air conditioner
Fourth, Mitsubishi air conditioning internal and external communication problems
If the outdoor unit has power, the red indicator light is on, the external unit does not start, you can check the communication between the internal unit and the external unit (check method: press the "TEST" key once after turning on, observe the indoor unit indicator), any kind of light Blinking is normal, otherwise there is a problem with communication; check whether the connecting wires of the internal and external machines are dedicated flat wires, if not, they should be replaced in time to avoid similar situations again. If the communication is normal, please check whether the temperature sensor of the indoor and outdoor unit is open circuit or short circuit or the resistance value is abnormal, and whether the overload protector port is connected well. If neither of the above two methods can be solved, replace the outdoor controller. Mitsubishi air conditioner internal machine
The above is a detailed explanation of the solution to the reason why the Mitsubishi air conditioner does not start for you. I hope it will help you.
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