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+--- Thread: KC868-A16 v1.6 – relays 9–16 not working in ESPHome (/showthread.php?tid=9214)
KC868-A16 v1.6 – relays 9–16 not working in ESPHome - dilo@interia.eu - 04-06-2026
Hi,
I use KC868-A16 (version 1.6).
I flashed ESPHome and I can control relays 1–8 correctly.
But relays 9–16 are not working.
I2C scan shows:
0x21, 0x22, 0x24, 0x25
PCF8574 at 0x24 works fine.
PCF8574 at 0x25 is detected but relays don’t respond.
I tried different pin mappings but still only first 8 relays work.
Can you provide correct ESPHome YAML for this hardware version?
Thank you.
I can provide logs or photos if needed.
RE: KC868-A16 v1.6 – relays 9–16 not working in ESPHome - admin - 04-06-2026
1. take a photo of your board , i want to see how you wire cable.
2. you can download KCS v2 firmware to ESP32, check 9-16 OUTPUT whether work well. if KCS firmware also can't work , it's hardware issue.