PF- error code means shor of gas/gas leak. It's not advisable to charge gas without finding out the leak.
To find out leak, remove all gas and then charge Nitrogen pressure up-to 300 PSI and then with soap solution or leak detector element you can find the leak. Arrest the leak by brazing/welding, Again pressurize with nitrogen to confirm no more leak. And then vacumize and do gas charging.
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