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CTEK Assist helps you with everyday questions for your 12v/24v or EV Chargers and includes product information, a product selector tool, troubleshooting, user manuals, compatible accessories and much more.
It draws on CTEK’s knowledge and documentation to point you in the right direction—fast.
CTEK Assist for PRO120
Charger is displaying "INTERNAL ERROR 74"
This error can sometimes be cleared by resetting the charger.
Unplug the device from the mains.
Wait for one minute.
Plug it back in.
If the error appears again, the charger has most likely developed a fault. Please contact your retailer for warranty assistance or to arrange a repair or replacement.