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I am looking to configure an Axpert max ii 8kW in a way that it will not take its own power from the grid. The house if often empty for months, and therefor there is hardly any need for power during this time. But if the Axpert takes it's own power from the grid (which it DOES @70W), then my...

Hi everybody. I had an Axpert max II 8kW installed lately of which the clock runs slow (about 5 mins per 24 hours). Service sent me the official firmware updates (81.07 and 22.20), but to no avail. I read that other people suffer the same problem. Has anybody been able to fix it? Thanks...