Question about Lennox 7 Series MS7-HO-09P MS7-HI-09P Heat Pump Wall Mounted Mini Split Sy

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How to reset a mini split A/c unit

I'm getting an E7 problem. I changed the coil and sensors but it did not resolve the problem. What can I do next? Proper Model is GCA 012N2-T3

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E7 code on amcoraire mini ductless unit


E7 i= "External Feedback Problem" which is a communication problem. There is a cable from the outdoor unit to the indoor unit ,check that cable is secured to the unit,check connections for tightness.
Here is the manual including instructions.
http://www.acwholesalers.com/EasyEditor/assets/amcor%20duo%20uchw-h12%20owners%20manual.pdf

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My ONIDA split ac shows E6 error. What is it and how can it be resolved?


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.

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1 Answer

My mini split system had an E2 code...replaced indoor pipe sensor...indoor unit works but outside unit does not...no other error codes, just motor not working outside


Check the outdoor unit to ensure power is available to it, and the contactor is closing on a call for cool 24-28 volt is present at the contactor coil to activate it.

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1 Answer

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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.

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2 Answers

Displayed F8 error


The F8 Fault means that the Temp sensor in the indoor unit that goes into the cooling coil is faulty.

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1 Answer

Pioneer show E7 A/C


E-7. This is a communication error between the indoor andout door units.Indoor unit coil sensor fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. if not replace sensor.

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1 Answer

I have a 18000btu LG mini split heat pump installed about 1 year ago in vacation home. In heat mode the unit cycles on and off when room temp is within 2-3 degrees of set point. Cycle on time varies...


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.

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1 Answer

Hello im trying to trouble shoot two split systems the electrical wires were crossed for the two units I fixed it the compressors wont come on, wall unit says e7? This is on the Amcoraire ac split systems.


E7 indicates an "External Feedback Problem" which sounds like a communication problem. I believe there is a sensor cable that runs from the outdoor unit to the indoor unit also. Check that all cables are properly run to the appropriate unit and check all connections for tightness. Here is the link to a manual that includes installation and wiring instructions.
http://www.acwholesalers.com/EasyEditor/assets/amcor%20duo%20uchw-h12%20owners%20manual.pdf

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2 Answers

ERROR CODE CH5 AIRCON SPLIT LG


This error is a communication error between your indoor and outdoor unit. You can try turning the breaker off for a few minutes and restart the unit. However if that does not work its best suggested to have an authorized HVAC technician service the unit.

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2 Answers

I have an 18 K unit with E7 error on heat mode


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.

Good luck

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