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The system runs but both the high and low so pressure erratically go up and down. the low side does not go under 600kpa, the high side between 1500 and 2000kpa. the system is an lg ducted on R22 refrigerant

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This can be caused by moisture in the system and when the moisture freezes on the capilliary tube you get a fluctuation, it the defrosts and passes through and again causes an up and down. Same would apply for excessive air in the system. You would have to do a long vacuum and possibly instal an inline filter drier.

Posted on Mar 10, 2009

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