single bulb in mine. upgraded from the stock bulb (since it wouldn’t shut off completely) to these:
I have extras if you want me to ship one out to you guys.
This is very much appreciated, thank you!
Hopefully it turns out otherwise, or turns out to only affect some units. Here’s hoping for the best of outcomes!
Perfect, I just ordered 2 sets!
Can you also let me know what fan you have? I’m sure I’ve asked before, but can’t remember 
haha no worries - https://www.homedepot.com/p/Hugger-52-in-LED-Gunmetal-Ceiling-Fan-AL383LED-GM/304542817
Thanks, I hope so too!
We’ve sold just over 1k units of these so far and it looks like maybe 20-30 here in the forums have this problem, I haven’t been monitoring the tickets for this issue so there could be more and our returns have been fairly low, so I’m hoping it’s just affecting a handful of users. What makes me a tad nervous (or gives me hope, I haven’t figured it out yet) is that @D.Hunt and @PJones have three fans installed with all three exhibiting this behavior, @dan1 has 4 installed with all four exhibiting this behavior. So it’s either a design flaw or something to do with bulbs.
@D.Hunt, @PJones, and @dan1 – do you have the same bulbs in every fan or are they different? Also are the fans the same or different? Apologies if you’ve already answered these questions, it’s hard to sort through both threads!
They are different bulbs in each fan. I have three 40W candelabra base incandescent bulbs in a Hampton Bay fan, three 7W standard base dimmable LED bulbs in a Hunter fan, and a single standard base 43W incandescent bulb (halogen) in the last fan (Hampton Bay I think). All show the random “blink” but it’s more pronounced on the fan with the LED bulbs because I think LEDs take just slightly longer to recover, but it’s still a very quick blink.
I should also note, I purchased all four of the switches at the same time. Just haven’t installed the last one yet.
… and the firmware in all three switches has been updated to 1.36. Though I do remember seeing it in the release version prior to 1.36.
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I have tried the following bulbs in both styles of fans that I own and all have flickered:
https://smile.amazon.com/gp/product/B001EFYVF0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://smile.amazon.com/gp/product/B01DJGAYJI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I have the following two fans:
-3x Harbor Breeze Mazon (non led older one, see video) (https://www.youtube.com/watch?v=VuKD2o7okMA)
-1x Hampton Bay AC-552 (BT52-5LKRC) “NN” Manufactured in Jan 2002 “YL”
I currently have this LED bulb in one my Mazon fan and it works great without any flickering, the only issue is the amount of brightness is too low compared to halogen bulbs:
https://www.homedepot.com/p/Feit-Electric-75-Watt-Equivalent-Bright-White-3000K-T4-Mini-Candelabra-E11-Base-Decorative-LED-Light-Bulb-BP75MC-830-LED-HDRP/309790457
I’ve had the issue with all three firmwares so far (stock, 1.34, and 1.36).
I’ve tried the following bulbs, all had the same issue:
https://www.amazon.com/gp/product/B085L4FF8N
https://www.amazon.com/gp/product/B086198GW3
https://www.amazon.com/gp/product/B07FCM2CBB
Fan info:
Harbor Breeze Crosswinds
I’ll try to get a recording of the blink as well
Eric_Inovelli I have noticed this flicker on both of the fan switches I have installed. I have been quietly following this post in hopes it could be fixed with a firmware update. But, from the sounds of it, its probably not the firmware. Do you want people with this problem to create a ticket so you can keep track of it, or wait till the problem is solved?
Ok good news everyone - the manufacturer has been able to replicate this and the engineers are looking into this. More to come!
@Tccshenkes - great question - let’s wait until we know what the issue is and then once we know, I can reach out to you via PM or provide a link in this thread for anyone experiencing this problem. Our ticketing system isn’t as robust with tracking issues
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I have the same bulb in each fan and all 3 fans are identical. All 3 fans installed the same day. So I had new bulbs that I had not used before, new fans and new switches all at once.
This is the bulbs I have.
https://www.lowes.com/pd/GE-Refresh-60-Watt-EQ-A19-Daylight-Dimmable-LED-Light-Bulb-8-Pack/1000444975
This is the fan
https://www.homedepot.com/p/Hampton-Bay-Rockport-52-in-LED-Oil-Rubbed-Bronze-Ceiling-Fan-with-Light-Kit-51751/301136114
Bump… Any updates? This quick off/on flash is beyond annoying.
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Hey thanks for bumping this – so the long story short of this is that there is an issue with the canopy firmware.
Here’s the analysis from the man, myth and legend @JasonL_Inovelli:
Bulb Flicker issue Cause Analysis:
Because the fan module needs to periodically obtain the current power and save it to the internal flash, when saving to the end of the storage space, it will be erased first and then saved again. The erase operation will forcibly stop all interrupts, causing the MCU to fail to enter the PWM control interrupt. , The zero-crossing detection is interrupted, which will cause the loss of the zero-crossing interruption and the abnormal PWM waveform, which will eventually lead to the problem of occasional bulbs flashing.
Solution:
Adjust the flash read and write time dynamically according to the brightness level of the device, so that the flash erase time does not cover the zero-crossing interruption time, increase the PWM running time compensation after flash erase occurs, and reduce the impact of flash erase on the PWM waveform; When the zero-crossing interrupt is lost, the software delay is used to generate the zero-crossing point to ensure that the PWM operating waveform will not be lost after the zero-crossing interrupt is lost, and the device can still run according to the predetermined PWM timing.
Jason and I have no clue what that means as it came from the engineer, but the long and the short of it is: When the fan module erases the flash or the power supply is not stable, the PWM output will be unstable which cause the bulb flicker. So they revised the firmware to dynamically adjust the time of flash erase and used the software compensation when the power supply is unstable, to make sure the PWM output is stable
The GIF I used to respond to that was:
So, what we’re going to do is for anyone that is experiencing this issue, we’ll replace the canopy module with the new firmware for you. The manufacturer is working on creating a jig which we can attache to the PCB board to upgrade the firmware.
In other words, we need to procure x amount of units from the manufacturer with the updated firmware and when we receive the old modules from everyone, we can update the firmware via the jig so we can have some extras in stock to replace any further issues.
What does that mean to you? We are working on obtaining the replacements. The manufacturer is working on producing these for us in an emergency use. More to come on when they are available and when we can obtain the jig.
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JasonL’s diagnosis makes sense to me! It also brings up a question about how often they are writing power data to the flash, and what the chip manufacturer’s specified write lifetime is on that flash?
Both of the LZW36’s that I have installed so far are showing the occasional dip. Is it annoying me so much that I want to drop the fans and send both canopy modules out? Not yet…
Yeah, I agree that will be a tough one to find the interest to do since we use the fan lights so infrequently but it is noticeable when we do so maybe. I wish it could be updated OTA like the switch module.
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So we will have to send back to you the faulty canopy module? What will happend to people that live outside USA?
Great news. I waited a long time for someone to create this type of switch, I can wait a little longer for this fix.
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