What should I do if I encounter an error code or display like 'Err'?
If the voltage exceeds 15.6V in 12V mode, an 'Err' message will be displayed and charging will not start. Similarly, if terminals are reversed, a 'POL' warning appears. Address these issues according to troubleshooting steps in your user manual.
From the official Ultimate Speed Ulgd 10 A1 Vehicle Battery Charger manual, page 16
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