I have my new G400 video doorbell installed with a 24VAC transformer and wifi since last Friday, March 20, it started out smooth and everything working as it should. About 24 hours later I started having problems of it completely stopped detecting motion and recording in Apple Home, it also stopped detecting motion and local recording to microSD card in Aqara app as well. When I looked at the log for the camera in the Aqara, usually it was show a time stamp from about when the last detection happened and then no more. But if I pulled external power and soft restarted or pulled external power multi times + a combo of soft restarts it would start working normal again (for a set time (hours or so) then start failing again). I was pulling all my hair out, I had 3+previous video doorbells in exact same spot and never had issues with wifi, or power, or angle, or distance, so I ruled those all out quick. then I started restarting Apple Hubs, and unplugging hubs, factory resetting the doorbell and setting it back up again, nothing would fix it longer than hours. THEN I CAME ACROSS DONIE, an Aqara PM here, he talked about power supply requirements, that made me triple check mine, low and behold, I had a 24VAC 0.5a PS but the G400 is calling for a 1.3a PS. So I hopped on amazon yesterday, searching searching searching and found a 24VAC 1.6a power supply which could arrive between 4am and 8am this morning, low and behold it arrived at 6am this morning so I swapped out my old working G410 doorbell along with the old 0.5A power supply transformer. I just changed the power supply transformer for my G400 doorbell from a 24VAC 0.5a to a 24VAC 1.6a. Lets see if that helps my issues with motion detection and recordings being missed completely for hours/days in Apple Home. thanks to Donie, I checked my transformer, I being using for my last 3+ video doorbells without issue and noticed I was only using a 24VAC 0.5a output PS, which is well below the required 1.3a needed, and this new one is 1.6am. I installed it a few hours ago when I saw out from the old 0.5a one and disconnected my G410 at the same time. Here is some graphs to show the amps the Eve Smart outlet was showing being consumed between the two different power supplies and doorbells as well before and after my changes. thanks Donie!! And you can see after installing the bigger amp transformer with the G400 doorbell, now the Eve is showing higher amps being consumed, so hopefully this fixes my issues.
I did also (earlier this week) updated all my hubs and iPhones to 26.4, I did never see the freezing of live video issue. But I did notice, when I am not home and view the live view of G400 video doorbell in Apple Home its definitely a lower resolution than when I am home viewing live view through the Apple Home.
thanks everyone for the support!
please let me know if you have any questions or I confused someone or missed something!
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@n1976jmk Thanks so much for sharing your detailed experience with the G400 video doorbell! It’s incredibly helpful to hear how you troubleshooted the motion detection and recording issues—especially the key insight about the power supply requirements. Many users might overlook the transformer specs, so your real-world example of upgrading from a 24VAC 0.5a to a 1.6a supply could save others a lot of frustration.
It’s great that you ruled out common factors like Wi-Fi and hub issues first, and kudos for catching the power mismatch—Donie’s tip clearly made a difference! The graphs from the Eve Smart outlet are a nice touch to visualize the change in power consumption too.
Fingers crossed the new transformer keeps everything running smoothly long-term—feel free to update the community later if you notice any improvements (or if there’s more to share)! Your willingness to document and share this process is what makes the Aqara community so strong. Thanks again for contributing—this will definitely help others with similar setups! 
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hi @AqaraBot, thanks for the kind message. If I have learned anything over the past experiences in IT, the fix for a problem is not always obvious, also the fix is always not explainable, and the fix doesn’t always make sense, hence the transformer low amperage issue. Also, I have learned when resolving an issue, it is never just one problem. with that said, the correct amperage for the new transformer defintely helped a lot, but the doorbell is probably picking up 80/85% of motion and recording in Homekit now. One issue that I notice is continuing is before with the old transformer that at night the g400 would constantly switch from color to b&w, and when you watch the camera live, you can hear the IR sensors clicking on a off (right now I have the IR night vision set to auto on, which is its default setting), when I turn it off, the camera stays in color, my previous smart video doorbells (including the latest previous aqara g410) always stayed in color since my front yard has a lot of light at night (and previous smart video doorbells did better job (higher quality) rendering the video in a better quality color. Seems maybe? a FW update could help? But in my mind, it could come at a later date,
I’d like to see the following issues addresses sooner than later but in no particular order)(also understand I bought a brand new model from a company, which is never going to be perfect on day 1):
1- IR flopping on and off at night when the Aqara app has the IR set to auto
2- when viewing live view of the G400 video doorbell in Apple Home when not home, the video resolution/quality is low (but the recordings are still in 2k resolution) and viewing the live view of the G400 while at home in Apple Home the video resolution/qaulity is fine.
(the issues above maybe a user error on my part and not a defect of the G400, so apologies in advance if that’s the case)
(also if Aqara Support would like my help troubleshooting or testing anything just let me know, kind of like a public beta/early adopter testing with the G400)
thanks all and this is my latest update about 48 +/- hours in with the new higher amperage transformer.
Picture 1 - this is the previous 18 hours of amperage graph use seen by my Eve smart outlet, you can now see the amperage is steady at higher than it was before with the old transformer
Picture 2 - this is the G400 at night in color with the IR illumination turned off
Picture 3 - this is the G5 Pro Hub ethernet in color night vision right next to it (understanding it’s not a fair comparison but just showing the lighting and grass color).
