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I happened to have a spare back board and I still get the errors. The error is displayed right after power own. I checked all transformer points and they are good. The cable that connects back to front boards is in bad shape, any way to test on the front board end?

I have been getting the 121 error and my pool is not generating chlorine. I read about the voltage issue and metered at 36v dc. This is a bit high, correct? I have removed the cell and gave it an acid bath from a few known good guides. The cell did not foam/phis up and appears to be clean. I...