Overtemp - immediate shutdown

Same issue as reported in other threads with over temp.

Installed device (North America) - no neutral. SW1, L, L, O.

Upgraded firmware.

Device quickly ramps up temperature above the threshold (no event generated). Code status below. Is this a design issue or product issue?

time":"09:25","unixtime":1610375111,"serial":84,"has_update":false,"mac":"D8BFC019D088","cfg_changed_cnt":0,"actions_stats":{"skipped":0},"lights":[{"ison":true,"source":"http","has_timer":false,"timer_started":0,"timer_duration":0,"timer_remaining":0,"mode":"white","brightness":41}],"meters":[{"power":46.83,"overpower":0.00,"is_valid":true, "timestamp":1610357111,"counters":[45.738, 5.882, 0.000],"total":51}],"inputs":[{"input":0,"event":"","event_cnt":0},{"input":0,"event":"","event_cnt":0}],"tmp":{"tC":100.51,"tF":212.91, "is_valid":true},"calibrated":true,"calib_progress":0,"calib_status":0,"wire_mode":0,"overtemperature":false,"loaderror":0,"overpower":false,"debug":0,"update":{"status":"unknown","has_update":false,"new_version":"","old_version":"20201228-093141/v1.9.3@ad2bb4e3"},"ram_total":48368,"ram_free":35040,"fs_size":233681,"fs_free":114958,"uptime":4075}

Zitat

Calibration is done without error?

Yes. I read all the threads, changed to trailing edge callibration, updated firmware. Everything was successful. The status model was captured just before the device shutdown again. To me, that status indicates that everything is correct, around 46W power, except the temperature readings are clearly above the 95C threshold and it ramps up QUICK. I had to uninstall the unit. I only have 1, but I see others have this same problem. Is there a known problem with 120V no neutral operation?

After many attempts and discussion, including upgrade of different firmware, nothing worked. Now finally I tried replacing halogen bulbs with dimmable LED. This has eliminated the problem. The power is much lower and this seems to have made a difference. Power levels did not seem to be the issue as I have captured case with lower power shutting down before higher power case- there is something weird going on.

Now that the dimmer is stable, I am seeing the occasional flicker issue. I suspect this is line noise based on what I'm reading. I hope that can be resolved in firmware...