What to do if the screen shows 'Error Code 4'

It means the jump starter has entered the Safe Mode automatically.

If you have tried to start your car over five times within ten minutes, the jump starter will enter the Safe Mode automatically. The Safe Mode is a designed self-protection service of the HULKMAN product, which prevents the product from overheating.

Step 1: Remove the clamps from the car battery.

Step 2: Place the jump starter in a shady place and wait for 10 minutes until the “Error Code 4” message disappears automatically.

Step 3: Reconnect the clamps to the car battery correctly.

Step 4: Start the car engine.

Step 5: Remove the clamps from the car battery.

If you have checked the connection, there is no Error Code on the screen, and you still can’t start your vehicle with our product at over 80% battery power, please contact our customer support at service@hulkman.com with the following information:

1. Order number
2. The serial number of your product (Where can I find the serial number?)
3. Your vehicle model
4. Any images or videos for proof of the issue

Our agent will help you troubleshoot your issues, with the guarantee of an exemplary experience.