ERR: V3 indicates that you're using a regular Open Weather Map API key instead of a "One Call API" key.
When you see "ERR: V3" displayed on your watchface, it means the API key you provided is a standard OWM key, but certain weather datapoints require the One Call API 3.0 subscription.
The standard free API key from Open Weather Map. This key has limited access and won't work for all weather datapoints.
A subscription-based API that provides access to comprehensive weather data. Some weather datapoints in the watchface specifically require this API version.
Log into your Open Weather Map account and subscribe to the "One Call API 3.0" service. OWM offers a free tier with 1,000 calls per day.
After subscribing, create a new API key that includes access to the One Call API 3.0.
Enter the new One Call API key in your watchface settings.
New API keys can take 2-4 hours to become fully activated by OWM.
For detailed instructions on getting and configuring your Open Weather Map API key with One Call API access, check out our Open Weather Map Documentation
Important: Not all weather datapoints require the One Call API. Basic weather information will still work with a regular API key, but advanced datapoints (like hourly forecasts, precipitation probabilities, etc.) need the One Call API subscription.