Reported data error: false positive?

Emoncms
,
1

emoncms heatpump app is reporting a data error: Heat meter air issue detected.

How is this determined? I believe its a false positive, probably because I’m reporting flow and return temps from a buffer to the radiators, not from the heatpump to the buffer:

2024-10-2-zoomed-emoncms-graph
2024-10-2-zoomed-emoncms-graph2221×1231 213 KB

You can see:

  1. call for heat raises flowT without the heatpump turning on as it pulls heat from the top of the buffer,
  2. FlowT then drops as the heatpump comes on and mixes the buffer/draws from the bottom
  3. when call for heat ends, the heat pump can keep running

I’m not sure what period is triggering this error? The error might not appear in the screenshot, there are other calls for heat:
Emoncms - app view

2

Broadly speaking, the error is reported when there is Electricity consumption without corresponding Heat output. (Those are the symptoms of air in the system causing the heat meter to report zero flow, hence zero heat.)

I’m pretty sure it will be because your Heat output “falls off a cliff” whereas the Electricity input ramps down a little more gradually. I’ve circled the suspect areas in red:

image
image1380×764 101 KB

My graphs sometimes look similar to yours in this respect, due to variations in exactly when the meter readings are sampled, and I’m getting data errors reported too.

3

The error doesn’t appear in the screenshot, so this is a false positive that only exists in the daily view.

Related: HeatpumpMonitor.org flagging monitoring errors

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4

Yes there does seem to be case of it showing up in daily stats but not the power view, I need to figure out why that is!

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