home-climate-control/dz

"Sticky" sensors confuse economizer process control logic

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Expected Behavior

Sensor abstractions emit sensor data if available, error signal if not, on a defined rate.

Actual Behavior

Under undetermined circumstances, a sensor signal processing pipeline keeps emitting a stale reading as current, causing control logic to issue improper actuator signals. Meanwhile, sensors are working as expected, they are not the root cause.

Manifestation

Painfully obvious.
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Root Cause Analysis

At this point, it appears that the culprit is a flaky Z-Wave device - Minoston MP31ZP.

Workaround

For now see if using the optimistic flag in the configuration fixes the problem, however, hardware replacement is recommended. See Hardware Support for suitable replacements.

Related Issues

#280 , #292

Root cause identified, device replaced, continuing operation normally. Follow up and corrective action in #292.