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P7 current protection. check voltage. If it is triple phase system, interchange 1 and 2 nd phase in the out door, Be careful keep the power of before doing.
P7- communication problem between indoor and out door. Check power in out door. if there repair/replace out door PCB> If no power in out door, replace indoor PCB.
I think you should check your compressor manually . And then check the tempreature on discharge point of your compressor if tempreature increases then there is no problem of gas .
dear sir /madam
please know what is type your air-con i mean widow type or split type or Central air conditioning's unit .if your air con is window type air conditioner then remove cover (grill) and find there is air filter if your air con split type of then open its cover there down side of cover there.is filter located
if air con is central cooling unit the find out your filter in duct side i mean air blower side where fresh cool air going to your room .
use this method i hope you will find solution of your problems
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