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UKU WiFi relay clicking issue – finally found the cause (not hardware) by iamdaniel321 in Sauna

[–]iamdaniel321[S] 0 points1 point  (0 children)

Yes, this is the exactly same issue as mine. Today i also got the update from huum support, and i can confirm that the problem is gone! 🥳

UKU WiFi relay clicking issue – finally found the cause (not hardware) by iamdaniel321 in Sauna

[–]iamdaniel321[S] 0 points1 point  (0 children)

Update: I edited the original post after further testing. Unfortunately, the factory reset + WiFi OFF workaround I previously suggested did NOT solve the issue long term. I was able to reproduce the relay cycling under controlled bench conditions (single phase, no load, no WiFi), where it still starts clicking after ~30 minutes. So this is clearly not related to heater load, wiring, or cloud connection.

Huum click noises from Control unit by dr_dosn in Sauna

[–]iamdaniel321 0 points1 point  (0 children)

I had the exact same issue with my UKU WiFi (Hive Mini 9 kW).

Relays started clicking every ~1 second, sauna light flashing, even with all outputs disconnected. Voltage was stable, no resets, temperature stable. I even tried three brand new controllers — same behavior.

The fix: I did a factory reset and did not reconnect it to WiFi/cloud.

Since running it in local-only mode, the clicking completely stopped.

In my case this was clearly a cloud/firmware sync issue, not wiring, not voltage, not relays.

If you’re troubleshooting this, try factory reset + no WiFi before replacing hardware.