Hi,mitsubishi ms12tn mini split ,when i put on the

It really depends who made the mini split Marlene? It is usually and error state or the filters need cleaning because the unit has recorded low air flow. Turn off the breaker to the whole system for an hour to reset it. Wait 5 minutes before operation as it goes through it Self-Test.

https://www.google.com/search?q=mini+split+blinking+red+and+green
https://www.fujitsugeneral.com/us/resources/pdf/support/downloads/(OM)9RQ-12RQ.pdf


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try switching to cool mode and try turning it on if this doesnt work unit may be blown.

Call a technician! Ask if they are experienced in mini split systems. You can check the air filters. Check the outdoor coil to see if its clean or covered up with dirt. If it is then turn off power & wash it. And at the breaker or disconnect, turn off power, wait 5 mins, and turn it back on. Then give it 3-5 mins to see if it will reset itself. If this don't work, call a tech/service provider! These units are troublesome to troubleshoot.

hi, E1: communication error between indoor and outdoor unit.
Air Conditioning Fault Codes

E-6 Indoor unit heat exchanger sensor [ThIR] defective (resistance is open circuit or closed circuit).
• Poor connection of sensor connector on the indoor PCB.Rectify.

Hi I have Mitsubishi split unit which is 5 years old. when turn heat mode for 30 deg C on the remote condesing unit runs for about 6 minuts and stops. what would be the Technical problem ?Thanks an Apprentice.

P 4 code means problem with the outdoor unit, Most likely low on refrigerant. Check all copper pipe connections for leaks first, then add refrigerant after checking pressures.

Hi,
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Check out this tip that I wrote about that...

Mitsubishi Air Conditioner Troubleshooting and Repair
http://www.fixya.com/support/r5643983-mitsubishi_air_conditioner

heatman101

Heya Harmlhs,
If the system is going into a vaccum that shows the compressor is working I would say it is either short of gas or it is a problem with the RCD. If the compressor is getting really hot i would say that it would short of gas and it is not best to use it untill a licenced person comes and looks at it before the compressor is seriously damaged.

u must check if the unit outside is working when u turn on your air conditioner.