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Unusual processor I/O behavior, sometimes intermittent and erratic?

April 5th, 2023

Ensure all contactors/relay coils have suitable suppressors fitted as per site drawings. Check and improve earth bonding continuity throughout installation.

Switch off mains supply, remove all processor board and clean PCB edge connectors with suitable electrical contact cleaner before firmly re-inserting them.

If this fails to rectify the issue then a site visit by TVC is recommended to investigate.