If your Chromebook won't hold a charge follow the steps below. If the issue continues submit a tech ticket below.
Step 1: Insure that your plug is securely inserted into the computer port
Step 2: Insure the wall outlet is properly working
If it still doesn't charge:
Step 1: Unplug your charger from the wall and your Chromebook
Step 2: Plug your charger back into your Chromebook, then the wall
Step 3: Charge the device for at least 30 minutes
Last resort: Reset your Chromebook hardware
Step 1: Turn off your Chromebook
Step 2: Press and Hold the Refresh button (first) ⟳ + Power button
Step 3: When your Chromebook starts up, release Refresh