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- Jan 23, 2020
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If anybody can help with this one..... 3kw /Aurora PowerOne (ABB) system, 8 years old. One day the error 031 appeared, common relay problem, there was also a burn mark on the board, I replaced the four relays. System then showed a Riso Low error, I left it off for several days, cursed a lot, turned it back on, suddenly it worked, for 2 days, then Riso Low error appeared again. I tried each of the two strands, alternating inputs, and determined that the riso problem was in one of the two strands. Question: is it possible that a fuse was simply blown on one of the two junction switches? Or is there definitely a problem with the panel wiring? Rooftop system with very little head room, very difficult to check the wiring without removing the panels one by one. Any ideas are appreciated!!