LG Inverter V model LMN096HVT air conditioner multi unit has error code 9. How can I fix this myself?

What is the model of your air conditioner. With out that information i cant help you with your ac repair problem.

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5 Flash======
Communication Error (Indoor ? Outdoor)........
Data Communication Fault,,,,,,,

I believe the wiring may be incorrect. Here arethe fault codes.

05

Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

5

Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4
Hope this helps

Bob

Indoor unit faults = CH04 or C4
Fascia LED's
- RED = None
- GREEN = 4 Flash
Contents = Drain Pump / Float Switch
Case of Error = Float Switch Open Circuit (High Level Water Alarm)
Indoor Status = Off

clean your condensate drain line you can do this with a shop vac,
Read more: http://dgoma.es/multisplit_lg/lg-multi-split-units-error-code/#ixzz34dr3Cu00
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Hello,

Have you tried unplugging it and plugging it in again?

Pls check indoor to out door 6 wirings. May be interchanged by mistake.

Example- Black wire in N with indoor but connected in C with out door.

And also check whether the sensor wire from indoor to out door has connected.

Tnx

Communcation error between in and out.

Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

CH 24-Splits and Multi Splits = High or low pressure trip. Low at 1 bar High at 35 bar check pressures. Multi V = High pressure trip.

http://thermofrostcryo.co.uk/downloads/air-conditioning/lg-air-conditioning-systems/fault-codes/Splits-multiSplit-service-information-Jan11.pdf