When the Grizzl-E gives a 1 Red Flash error that continually repeats this may be due to a Lost Ground issue in your outlet. The Ground line in the outlet might not be connected properly.
We suggest you or your electrician measure the voltage in the outlet with a multi meter:
L1/L2 to Ground should be 104V-120V +/-10%
L1 to L2 should be 208V-240V +/-10%
If the voltage measurement is within the acceptable range, and the charger continues a Red Flashing error, fill out the Technical Support form.