Check/Clean Cell Purifier off

[rebomax]

Thanks for replying. I just got back in to town. The system is setup for 220 VAC and getting that at the connections. When I do the self test I get 15 v and 3.6 amps, at the cord end I'm getting 28.5 v. When I put it on boost it says check/clean cell. When I put it on power level 3 @ 50% it says cell amps. All 3 fuzes are good. I replaced the cell and the readings are the same. How can I check to see if it's PCB?