KC868-A4 – Relay 1 clicks repeatedly when WiFi Access Point (AP) is enabled

KC868-A4 – Relay 1 clicks repeatedly when WiFi Access Point (AP) is enabled - Printable Version

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KC868-A4 – Relay 1 clicks repeatedly when WiFi Access Point (AP) is enabled - Natravn - 11-02-2026

Hello KinCony team,
I have a problem with my KC868-A4 board.
Problem:
Relay 1 switches ON and OFF intermittently when WiFi Access Point (AP) mode is enabled.
I have performed several tests using a simple Arduino sketch with no relay control code at all.
Test results:

Code:
WIFI_MODE_NULL
– WiFi disabled: No relay clicking.
Code:
WIFI_STA
– Station mode, without connecting to any network: No relay clicking.
Code:
WIFI_AP
– Access Point mode: Relay 1 starts clicking intermittently.

Additional information:

The DS18B20 temperature sensor on GPIO13 works correctly in all tests.
I have tried a different power supply. The problem remains.
No external loads or devices are connected to the relay outputs.
Relay 1 is the only relay that clicks.
The LED for relay 4 stays constantly illuminated.

My questions:

Is this a known issue with the KC868-A4?
Could WiFi AP mode interfere with GPIO2 or the relay driver circuit?
Could this indicate a hardware fault on my board?
Is there a recommended solution?

I would appreciate your help in identifying the problem.
Best regards
Natravn

RE: KC868-A4 – Relay 1 clicks repeatedly when WiFi Access Point (AP) is enabled - admin - 11-02-2026

can you test with KCS v2 firmware firstly?
here is KCS v2 firmware online guide: https://www.kincony.com/esp32-kcsv2-firmware.html

RE: KC868-A4 – Relay 1 clicks repeatedly when WiFi Access Point (AP) is enabled - Natravn - 11-03-2026

Big Grin

Hello KinCony Support,
Thank you for your suggestion.
I have tested the KCS v2 firmware (v2.2.21) as requested.
I have since returned to my own Arduino firmware, which I am developing into a standalone web-based controller for my Bradley smoker.
The current setup is working well, including WiFi Access Point mode and the web interface.
The relay behaviour I observed was during my earlier testing and is not currently an issue with the present setup.
Thank you for your assistance.
Best regards Smile

Natravn

RE: KC868-A4 – Relay 1 clicks repeatedly when WiFi Access Point (AP) is enabled - admin - 11-03-2026

ok, good.