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Hello all, Recently we performed an installation of 2 PLCs model SM43-J-R20 (both containing the same program and updated to the last OS) to control 2 oil boilers. A few days ago, our customer reported the following problem from only one of them: Sometimes, one of the PLCs shows a backlighted black screen (as seen in the attached picture). However, the process in the PLC seems not to be affected since it keeps running. Then, if they restart the PLC, it works well. (Note that the PLC has been powered ON for hours when this happens). We replaced the PLC with a new one with no results. The problem is still the same. As additional info, the installation includes one contactor directly driven at 220V by a relay output from the PLC and we think that the problem described happens at the moment when the contactor is actuated (our customer is not sure about it). But as I said, it doesn't always happen as a regular issue and only one of both PLCs is showing this behavior even though they contain the same program and electrical installation. Any ideas? Thanks.