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The blinking is an indicator that it needs service. 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. 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. It states a "communication error". This means the outdoor inverter board is not "talking" to your indoor unit or vise-versa. Could be a sensor or the inverter board. Or any other component wired to that board.
There is a temp. probe on the inside unit.(evaporator). If you open the front panel you should see 2 white air filters. With the right side one removed you should see a black probe on the coil. Possibly that probe needs replacement. Very possible there is also a defrost sensor connected to the outside condensing unit. That sensor is connected via a white plug in connector.. Replace that one too if possible.
Hello.I think they are on to something with shortcycling on temp sensor.I think it should be sampling the return air instead of (inside coils ?).A 2*f dead band use to be built in (factory installed) to thermostats to prevent on/off, but not sure in this case.Try a new sensor location(return air) and see if anything changes.
I just installed a YMGI brand mini-split AC and had exactly the same problem. AC worked fine, but when I tried using heat mode I would get an E7 error.
After talking to their tech support I discovered the problem. There was a separate cable that needed to be connected that I'd forgotten to hook up. This cable runs from the internal unit to the outdoor unit and connects a defrost sensor.
In my case I had totally missed that cable when I installed the unit. After running another line and connecting it the unit is now functioning normally.
If this is a new install, then make sure all your cables have been run. If it was previously working, then check to see if one of the cables had become disconnected. If it's not the cable, then it's probably the sensor.