Blue on-off switch powers off when turned off

Product Support
, ,
41

I just installed one of these switches with a newly installed Broan exhaust fan (https://www.homedepot.com/p/Broan-NuTone-Roomside-Series-White-50-CFM-No-Cut-Roomside-Installation-Bathroom-Fan-with-Light-ENERGY-STAR-Bathroom-Exhaust-Fan-BENL5/329778011), and am experiencing the reported issue. This switch is only controlling the fan, the light is on a dumb switch temporarily until my presence sensing switch arrives.

When I added the switch to Home Assistant (Zigbee2MQTT), it mentioned that there was a firmware update and I installed it right away. Currently if I manually check the version I get:

[12/13/2025, 7:49:36 PM] zhc:tz: Read result of 'genBasic': {"swBuildId":"1.02"}

Though in the UI it said the firmware version was 1.01 for a while, and now says ā€œunknownā€. The on-device firmware indication though agrees that itā€™s 1.02. The OTA tab says the firmware build date is 20251017 and that there is not a new version available.

Unfortunately, when I turn the fan off the switch loses power and needs reset with the air gap. So despite apparently being on the new firmware version, Iā€™m experiencing the issue it was supposed to address. If I disconnect the load, the switch behaves correctly. I notice that when I do have the load connected and turn it off, the relay clicks and the LED bar remains illuminated for a second before turning off completely.

I am slightly worried that there was an issue installing the firmware, the first time I noticed it lose power was while the firmware was updating and I thought at first it was just not responding because it was still installing. But eventually I realized it was totally depowered and reset it. Is it possible that there was a firmware installation error that results in it thinking the version is 1.02 when itā€™s not?

Do I need to try to downgrade and re-apply the update? I donā€™t see a v1.01 firmware file as available anywhere and Z2Q says INVALID_IMAGE if I just send it the command to downgrade.

42

Did you ever figure this out? I installed my switch today on a bathroom fan and I am having the same issues. When powering off, the led bar hangs for a second longer and then goes black. I have updated the firmware to 1.02 but itā€™s still completely powering down when turning off the switch.

43

Also having the exact problem. Almost every time. Reset the switch and double checked the wiring. No issue with identical switch and fan in other bathroom. Made sure I was on 1.02. @EricM_Inovelli, any insight into what was causing it for @travisp9412?

44

Hmmm, I thought the issue had been resolved with fw 1.02, but perhaps it needs further tweaking (if it is the same problem). ā€œThe timing of the relay activation has been optimized to reduce the interference caused when using Fan-type loadsā€. Iā€™ll have to ask the engineer to see what he thinks.

45

@bran @videosmithnj can you please post the brand and model of the fan that is attached?

46

Broan QTXE Series 150 CFM Ventilation Fan

47

You are sure it is on 1.02? I just posted 1.03 which has some unrelated changes (shown in the firmware log community post). Can you test it out? It should be available for Z2M and ZHA soon.

48

Functions properly now. There was nothing related changed? Only thing I can think of is that my 1.02 firmware was gotten from the same index that contained the 3.04 for the blue dimmers. Perhaps it was not the most updated version of the firmware?