Some difference in the measured temperature is considered normal because of the measurement uncertainties of the devices. If the difference is more than 10-15 degrees you should check your temperature sensor and sauna thermometer.

1. Are the temperature sensor and sauna thermometer placed in different parts of the sauna room where temperatures are actually very different?
2. Is the temperature sensor too close to the heater? Too close to the door? The best place to install it is on the opposite wall from the heater approximately 15 cm from the ceiling and away from ventilation tubes and windows.
3. Does your sauna thermometer work properly?

You probably need to replace your temperature sensor when even after fixing all the above-mentioned issues:

• the temperature difference is more than 20 degrees
• the temperature displayed on the remote control changes very suddenly or keeps fluctuating
• the message “Sensor error” is displayed

There could be a problem with the cable connection.

Take down the sensor and try connecting it to the main module using another suitable cable. If the sensor works, you just need to replace the cable. If it still does not work, the sensor needs to be replaced.

In these cases, please contact us at support@huum.eu.

In most cases, this happens when the cables of the remote control are not connected correctly.

• First, you should make sure that all the cables are connected to the main module according to the scheme in the installation manual. This should preferably be done by a certified electrician.
• Also, check if any cables attached to the remote control have come loose. If after checking all the cables the remote control still doesn’t work, please contact us at support@huum.eu.

If your UKU GSM controller does not connect to the network after connecting your app user account to the controller, please contact us and send a photo of the log (Menu -> GSM status -> log).

If your UKU Wi-Fi controller does not connect to the network, take a picture of the error log displayed after pressing “Connect”, and e-mail it to us at support@huum.eu.

Are you using the SIM card that arrived with the controller?

Contact us at support@huum.eu.

Are you using another SIM card?

• Check if the mobile data has run out.
• Find out if your service provider has changed the APN settings. If the APN settings have changed, update the settings also in the settings menu of the controller.
• Take the SIM card out and try if it works on your phone.
• If none of this helped, contact us at support@huum.eu.

Are the heating elements working properly?

To find that out, remove some stones and check if the heating elements turn red while heating. If a heating element does not turn red it is broken and needs to be replaced before further using.

Is there a problem with wiring?

Before checking that, disconnect the heater from the power supply. Make sure that all the cables of the heater and the control console are connected to the main module according to the manual.

If you did not manage to solve the problem, contact us and send us a photo of the main module’s wiring.

Are the heating elements working properly?

To find that out, remove some stones and check if the heating elements turn red while heating. If a heating element does not turn red it is broken and needs to be replaced before further using.

1. Check if heater or control console cables have come loose.
2. Ask an electrician to check if all three phases are connected and actually reach the heater.

If the previous steps did not provide a solution, the problem may be in the main module. In that case, contact us and send us photos of the wiring of the heater and the main module.

Does your heater have sufficient output for the size of your sauna room?

Check the product page or user manual.

Did you take the uninsulated and glass surfaces into account when calculating sauna room volume?

Are the heating elements working properly?

To find that out, remove some stones and check if the heating elements turn red while heating. If a heating element does not turn red it is broken and needs to be replaced before further using.

Is there too much ventilation in the sauna room?