《装了5个小时没成功，最后发现是插座USB口的锅——Aqara G4门铃避坑指南》
先说结论:
如果你家G4门铃死活连不上，先换充电头！不要像我一样，折腾了5个小时，换了3个路由器，重置了20次……最后发现，是墙壁插座自带的USB口供电不足。换上手机充电头，5分钟搞定。
If your G4 doorbell just won’t connect, try a different power adapter first . Don’t make the same mistake I did - 5 hours, 3 routers, 20+ resets… only to find out the issue was insufficient power from a wall socket’s built-in USB port. Switched to a phone charger, and everything worked in 5 minutes.
事情是这样的 / Here’s What Happened
我是搞电气工程的，家里要装一套Aqara的安防系统：M1S网关、门窗传感器、G4可视门铃。按照说明书一步一步来，结果卡在G4门铃上。
中继器插上电，灯亮了。按10次重置？没反应。长按40秒？蓝灯闪两下就灭。换路由器、关双频合一、改WiFi名称……论坛上能查到的办法全试了一遍，就是不行。
折腾了整整一个晚上，从怀疑网络到怀疑人生。
I’m an electrical engineer by background. I was setting up an Aqara security system at home: M1S hub, door/window sensor, and the G4 video doorbell. Following the manual step by step, I got stuck on the G4 doorbell.
The chime repeater powered on, the LED lit up. Pressed the button 10 times to reset? No response. Held for 40 seconds? Blue LED flashed a couple of times and died. Changed routers, disabled band steering, renamed the Wi-Fi… tried every solution I could find online. Nothing worked.
I spent an entire night troubleshooting, going from questioning my network to questioning my life choices.
问题的真正根源 / The Real Root Cause
最后，我注意到中继器是插在墙壁插座自带的USB口上的。随手换了一个手机充电头……然后，全好了。
为什么？
墙壁插座上的USB口，输出电流通常只有0.5A-1A。而G4中继器在重置、联网时需要更大的瞬时电流（大概1.5A-2A）。
供电不足的后果不是“完全不亮”，而是“能亮灯，但干不了重活”。就像汽车怠速时能听收音机，一踩油门就熄火。
注意：这跟设备质量无关，跟充电头功率有关。
Eventually, I noticed the chime repeater was plugged into a wall socket’s built-in USB port . On a whim, I swapped it for a regular phone charger… and everything worked perfectly.
Why?
Wall socket USB ports typically output only 0.5A to 1A. But the G4 chime repeater needs higher instantaneous current (around 1.5A to 2A) during reset and network connection.
Insufficient power doesn’t mean “no lights at all” - it means “lights work, but can’t handle heavy tasks.” Think of it like a car that can power the radio at idle but stalls as soon as you hit the gas.
Important: This has nothing to do with defective hardware. It’s all about power adapter quality.
关于客服建议 / On Customer Support Advice
在折腾过程中，Aqara客服建议我放弃Aqara Home，改用Apple HomeKit。我没有采纳。
原因很简单：如果问题出在供电或网络上，换平台根本解决不了。而且我家的其他Aqara设备（网关、传感器）在Aqara Home里都正常，凭什么门铃就要换平台？
事实证明我的判断是对的——问题根源是供电不足，跟用什么平台没有半毛钱关系。
这里想说的是：客服的建议不一定都是对的。他们有自己的流程和话术，有时候“让你换平台”只是因为那是一条他们熟悉的、容易执行的路径，而不是真正解决问题的路径。
During my struggle, Aqara customer support suggested I abandon Aqara Home and switch to Apple HomeKit. I didn’t take that advice.
The reason was simple: if the problem was power or network related, switching platforms wouldn’t fix it. Besides, all my other Aqara devices (hub, sensor) were working fine in Aqara Home. Why would the doorbell be any different?
My judgment turned out to be correct - the root cause was insufficient power, which had absolutely nothing to do with which platform I was using.
The point is: customer support advice isn’t always right. They have their own processes and scripts. Sometimes “switch platforms” is just an easy path for them to suggest, not the path that actually solves your problem.
关于双频合一的发现 / A Note on Band Steering
我还发现一个有意思的事：我家光猫是双频合一的（2.4G和5G同一个WiFi名字），用新买的2.4G路由器安装成功后，我试着换回光猫的双频合一WiFi重新添加门铃，竟然也成功了。
这说明双频合一“偶尔能用”，但不是每次都能用。路由器内部的算法有时候会把门铃分配给2.4G（成功），有时候分配给5G（失败，因为门铃不支持5G）。
结论：关掉双频合一，让2.4G单独用一个名字，是最稳妥的做法。偶尔成功不等于稳定可靠。
I also discovered something interesting: my ISP’s modem/router has band steering enabled (2.4GHz and 5GHz share the same SSID). After successfully setting up the doorbell with a dedicated 2.4GHz router, I tried switching back to the modem’s band-steered Wi-Fi - and surprisingly, it worked too.
This means band steering can work occasionally, but not consistently. The router’s algorithm sometimes directs the doorbell to 2.4GHz (success) and sometimes to 5GHz (failure, since the doorbell doesn’t support 5GHz).
The takeaway: disabling band steering and giving 2.4GHz its own unique SSID is the most reliable approach. “Works sometimes” is not good enough for security devices.
给普通用户的傻瓜式指南 / A Simple Guide for Regular Users
如果你不想像我一样折腾，按这个顺序做：
第一步：供电
- 不要用墙壁插座自带的USB口
- 不要用电脑的USB口
- 不要用劣质充电头
- 用手机原装充电头（5V/1.5A以上）插上就完事
第二步：网络
- 进路由器后台，关掉“双频合一”
- 给2.4G Wi-Fi单独起个名字（纯英文，不要加符号）
- 手机连这个2.4G Wi-Fi，再添加设备
第三步：重置
- 如果还是不行，中继器拔电等30秒再插
- 门铃电池取出来等5分钟再装
- 然后再试
这套流程走完，99%的问题都能解决。
If you want to avoid my pain, follow this order:
Step 1: Power
- Don’t use wall socket USB ports
- Don’t use computer USB ports
- Don’t use cheap, no-name chargers
- Use a phone charger (5V/1.5A or higher) - that’s it
Step 2: Network
- Log into your router, disable “band steering” or “smart connect”
- Give your 2.4GHz Wi-Fi a unique name (English letters and numbers only, no symbols)
- Connect your phone to that 2.4GHz network, then add the device
Step 3: Reset
- If still stuck, unplug the chime repeater for 30 seconds
- Remove the doorbell batteries for 5 minutes
- Try again
Follow this sequence, and you’ll solve 99% of connection issues.
给Aqara的建议 / Suggestions for Aqara
我一个搞电气工程的都这么费劲，普通人怎么办？
建议改进两点：
- 加个欠压提示：检测到供电不足，直接语音说“电源功率不够，请换充电头”
- 重置流程简化：别搞什么“按10次”“长按40秒”，一个物理复位按钮或者“长按20秒恢复出厂”就够了
设备是给人用的，不是给人折腾的。
If an electrical engineer struggled this much, what about regular users?
Two suggestions:
- Add low-power detection: when insufficient power is detected, the device should simply say “Power supply insufficient, please use a different charger”
- Simplify reset procedure: ditch the “press 10 times” and “hold for 40 seconds” complexity. A physical reset button or a simple “hold for 20 seconds to factory reset” would be much better.
Devices should serve people, not frustrate them.
最后 / Final Words
如果你也遇到G4连不上的问题，先换充电头试试。
大概率不是设备坏了，也不是你操作不对，就是供电那点事儿。
If your G4 doorbell won’t connect, try a different power adapter first.
In most cases, it’s not a defective device or user error - it’s just a power issue.
