'Sum' state-combiner breaks

Configuration
1

I have a simple “Combine the state of several sensors” helper that just sums two custom sensors (uploads and downloads) to create a total “internet usage”.

I’m trying to use the UI as much as possible instead of the YAML files, so this is what it looks like:

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It works fine for a about half a day, but then stops outputting with what looks like a units error:

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If I delete and re-create the helper, it will repeat the same cycle.

Before I abandon the UI and go back to YAML, am I doing something wrong here? The two source sensors are both Utility Meter helpers with “GB” units of measurement.

2

Have you checked your logs for errors?

3

I haven’t seen anything in the logs at the time that reporting stops; but once it no longer works, there are a couple errors logged on startup:

Logger: homeassistant.components.min_max.sensor
Source: components/min_max/sensor.py:332
Integration: Combine the state of several sensors (documentation, issues)
First occurred: 9:39:07 AM (2 occurrences)
Last logged: 9:39:07 AM

Units of measurement do not match for entity sensor.internet_usage_monthly

So it’s consistent with this being a units issue, but I’m not sure how that can become a problem after the template has already been working; it implies that one of the source sensors unit of measurement is changing, but that shouldn’t be possible.

4

Which integration is providing your source sensors?

5

Raw data is from an OpenWRT router connected via the uPnP/IGD integration. That provided “data sent” and “data received” sensors (in B).

I then use each of those sensors to create Utility Meters for monthly total uploads/downloads (in GB).

Now I just want to Sum the two Utility Meters for a single total.