Komatsu PC400 LC8 I have an heating problem on my PC400. I have "air conditionner error" show on the main screen while working. When i go in the fault codes screen in the air conditioning system i got an error on the ventilation line that i can read "ventilation 1 E Abnormal". The mechanical problem on my unit is that i don't have enough heating in the cab. Can somebody help me with the code shown in the picture below.

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put finger in power socket

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hi, better check the TCV (timing control valve) located below the injection pump.

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Go to your outside unit and press the K3 button.

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CODE PO420 CATALTYLIC CONVERTER SYSTEM FAULT.ITS SAYING FAULTY CATALTYLIC CONVERTER.IF IT BEEN A WHILE IF YOUR CAR HAS A WHOLE LOT OF MILES ON IT.YOUR SPARK PLUG CHANGE IS DUE AT 120000 MILES. DUE A LITTLE TUNE UP CHANGE AIR FILTER AND FUEL FILTER.SEE IF YOU HAVE ANY ENGINE FAULTS BAD PLUGS DIRTY INJECTORS ANY THING UP SET FUEL SYSTEM CAUSE CAR TO RUN RICH.EXCESSIVE UNBURN FUEL WILL GATHER IN CATALYTIC CONVERTER CAUSE IT TO BURN OUT.SHORTING LIFE OF THE CATALYTIC CONVERTER.

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i had this problem it was freezing up outside it was only a short pipe run so it was over gassed i took some out and it was fine