Troubleshooting

If the HUUM electric sauna heater warms up too slowly:

• Is the power rating of the sauna heater sufficient for the size of your steam room? Check the product page or the user manual.
• Did you take the uninsulated walls and glass surfaces into account when calculating the cubic size of the steam room?
• Are the heating elements functioning properly? To find out, remove some stones from the sauna heater and check if the heating elements warm up when the heater is switched on. If a heating element does not turn red, it is damaged and needs to be replaced before further use.
• Is there too much ventilation in the steam room?

A slight difference between the measured temperatures is completely normal. It derives from the intrinsic error of measurement that applies to the devices. However, if the difference exceeds 10–15 °C (50-59 °F) degrees, you should check the temperature sensor and the sauna thermometer. Check the following:

• Are the temperature sensor and sauna thermometer placed in different locations in the steam room where the temperatures actually differ?
• Is the temperature sensor too close to the sauna heater? Is it too close to the door? The best location for the temperature sensor is the opposite wall of the sauna heater, approximately 15 cm (5,9 in) from the ceiling. It should not be placed close to vents or windows.
• Is the sauna thermometer functioning properly?

If none of the causes described above apply, and the following problems persist, the fault likely resides in the temperature sensor and it requires replacing:

• the temperature difference exceeds 20 ° (68 °F) degrees
• the temperature displayed on the screen of the sauna controller changes abruptly or fluctuates constantly
• The message “Temperature input error” is displayed on the screen of the sauna controller

The cable might also cause these problems. Take down the sensor and try connecting it to the main module with another suitable cable. If the sensor starts functioning properly, you’ll just need to replace the cable.

In most cases, this happens when the cables of the sauna controller are not connected correctly. Only a certified electrician may connect the cables. Check the following to detect the reason of the fault:

• Are all cables connected to the main module in compliance with the diagram presented in the installation manual of UKU sauna control system? Manual: HUUM UKU Manual US
• Has a cable detached from the controller?

• If the controller of the UKU WiFi sauna control system does not establish a network connection, save a screenshot of the error log that is displayed after pressing “Connect” and email it to us at info@bsaunas.com

We’ll respond as soon as possible.

• Are the heating elements functioning properly? To find out, remove some stones from the sauna heater and check if the heating elements warm up after switching the heater on. If a heating element does not turn red, it is damaged and needs to be replaced before further use of the heater.
• Are the cables properly connected? Ask an electrician to disconnect the sauna heater from the power supply and to verify that all cables of the heater and the controller are connected to the main module in accordance with the user manual of the sauna heater.
• If this does not solve the problem, take a picture of the main module cabling and email it to us at info@bsaunas.com with a description of the problem.

We’ll respond at the earliest convenience!

Placement of sauna stones significantly affects the quality of the steam. In order to fill the whole space of the sauna heater properly, use smaller and larger stones.

• Sort out bigger and smaller stones

First, take all the sauna stones out of the boxes and separate the smaller stones.

• Fill the sauna heater layer by layer

Stack the sauna stones by layers – start from the bottom of the sauna heater and move towards the top. Stones should also be placed between the heating elements. If you first place sauna stones on one side only, the heating elements might deform or break. Start with bigger stones, and use smaller ones for filling the round parts of the heater and places where there is less space.

• Heating elements should not remain exposed

Leave sufficient gaps for air movement between the sauna stones, and don’t place stones too tightly around the heating elements. Ensure that the heating elements are completely covered and not visible from the exterior surface of the sauna heater. This is important as throwing water directly on the heating elements might damage them. It will also reduce the quality of the steam. Water should evaporate from the sauna stones and not from the heating elements. The top layer of sauna stones should be as dense as possible – this is where the heat arising from below accumulates.

Sauna stones don’t last forever. Contact with water and temperature fluctuations have an impact, and over time they eventually start crumbling. Therefore it is natural that every now and then they should be replaced with new stones.

Frequency of inspecting the condition of sauna stones and replacing them depends on:

• frequency of using the sauna, and
• the quality of sauna stones.

How frequently should sauna stones be exchanged?

• Check the condition of sauna stones once a year or after 300 hours of heating.
• If you heat your sauna three times a week on average, you should replace the sauna stones once a year.
• If you use your sauna less frequently, you should exchange the sauna stones once every couple of years.
• You should check the condition of the sauna stones when heating the sauna takes more time than usual or when the sauna heater does not warm up properly. This may be caused by small stone pieces that block air movement between the sauna stones.

How to check the condition of the sauna stones?

In order to inspect the condition of the stones, remove all the stones from the heater.

• Replace all the sauna stones that are eroded or have become remarkably lighter.
• Clean sauna stones that are dusty or covered with residues of iron-rich water.
• The most convenient solution is to replace all the sauna stones at the same time.

Previous sections provide information on how to prepare sauna stones before their use and how to stack the sauna stones into the sauna heater.

The required quantity of sauna stones depends on the particular HUUM sauna heater model.

• DROP electric sauna heater: approximately 121 lb / 55 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE electric sauna heater: approximately 595 lb / 270 kg of stones with a diameter of 2-4 in  / 5–10 cm
• HIVE electric sauna heater with air tunnel: approximately 529 lb / 240 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Mini electric sauna heater: approximately 375 lb / 170 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Mini electric sauna heater with air tunnel: approximately 309 lb / 140 kg of stones with a diameter of 2-4 in / 5–10 cm
• CLIFF electric sauna heater: approximately 165 lb / 75 kg of stones with a diameter of 1.2-2 in / 3–5 cm
• CLIFF Mini electric sauna heater: approximately 132 lb / 60 kg of stones with a diameter of 1.2-2 in / 3–5 cm
• STEEL electric sauna heater: approximately 331 lb / 150 kg of stones with a diameter of  1.2-2 in/ 3–5 cm
• STEEL Mini electric sauna heater: approximately 132 lb / 60 kg of stones with a diameter of 1.2 -2 in /3–5 cm
• HIVE Flow wood-burning stove: approximately 330 lb  / 150 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Flow Mini wood-burning stove: approximately 231 lb  / 105 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Wood 13 wood-burning stove: approximately 198 lb  / 90 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Wood 17 wood-burning stove: approximately 298 lb / 135 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Heat 12 wood-burning stove: approximately 198 lb / 90 kg of stones with a diameter of 2-4 in  / 5–10 cm
• Stone cage: approximately 88 lbs / 40 kg of stones with a diameter of 2-4 in  / 5–10 cm

Remove some stones from the sauna heater to verify that all heating elements are in proper working order and turn red when the heater is switched on. If a heating element does not turn red, it is broken and needs to be replaced promptly. Otherwise you risk with damaging other heating elements as well. Only a competent electrician may replace the heating elements.

The condition of the sauna heater should be checked every now and then. This is particularly important when the sauna heater has not been used for a while.

• If the sauna heater does not function properly (for example, the heater does not warm up or the sauna room warms up too slowly), you’ll find advice and guidelines on our support page “Troubleshooting” section.
• Before cleaning the sauna heater or performing other tasks, disconnect the sauna heater from the power supply and ensure that the heater is not hot.
• Check the condition of sauna stones once a year or after 300 hours of heating.
• Clean the stones when necessary. Replace sauna stones that have started to erode or have become remarkably lighter. Remove all small stone chips from the sauna heater. Learn more from the section “Sauna stones”.

Heating elements require replacement only when they are broken. Remove some stones from the sauna heater to verify that all the heating elements are in proper working order. Heating elements should become hot when you switch the sauna heater on. If the heating elements do not turn red, they are damaged and must be replaced.

No. A prerequisite of using HUUM electric sauna heaters is a controller that has a temperature adjustment function. Our sauna heaters are not equipped with an ON/OFF button.

The sauna control panel must be installed outside the steam room. It is recommended to mount it at the user’s eye level next to the door of the steam room.

The main module must be installed in a dry place that is easy to access. It is not recommended to mount the main module in the steam room – the user is solely responsible for installing the main module in the steam room.

When installing a UKU WiFi sauna control system, it is vital to ensure that WiFi coverage is available at the location chosen for the main module.

• Empty the ash drawer before using the sauna stove.
• Light the fire with something small and flammable – for example, with a newspaper or small pieces of dry wood. Gradually add the wood.
• HIVE Wood and HIVE Heat sauna stoves may only be heated with wood logs. Logs with the length of 11,8 in / 30 cm are most suitable for HIVE Wood 13/HIVE Heat. It is recommendable to use logs with the length of 15,7 in / 40 cm in the case of HIVE Wood 17.
• You can adjust the amount of oxygen in the combustion process by opening and closing the ash drawer. Ignition requires more oxygen, so it is advisable to keep the ash drawer open by approximately 10 mm (0,39 in). When the wood is already burning, close the ash drawer a bit, so that about 2–3 mm  (0,12 in) of the drawer remains open. Air flow of HIVE Heat can be regulated from the choke that is located above the door.
• Keep the furnace door closed during heating, and open it only for adding wood.
• Have your eye on the fire and observe when more wood needs to be added.
• When the sauna feels hot enough, it is ready for use.
• Continue adding wood for as long as you wish to keep the sauna hot.
• Avoid overheating the sauna stove. You are overheating your stove if the furnace casing starts glowing red. Overheating causes deformation of the metal, and in such cases, we are not responsible for the resultant damages.
• In case of overheating, close the ash drawer and the furnace door completely to stop the combustion process. If possible, occlude air inflow into the room.

• Choose the right stones for your sauna stove. Natural granite stones or special sauna stones sold at hardware stores are suitable for wood-burning HIVE Wood and HIVE Heat sauna stoves. Our product range includes round olivine diabase sauna stones with a diameter of 2-4 in (5–10 cm) that are suitable for these sauna stoves.
• Empty the ash drawer before each heating since it is used for adjusting the draft.
• Clean the heating surfaces of the furnace regularly, at least once after 20 uses.
• Check the condition of sauna stones once a year or after 300 hours of heating. When necessary, replace the stones.
• At least once a year ask a specialist to clean the chimney and the flue.
• If the sauna has not been used for a long time, the furnace ducts, the grate, and the ash drawer should be checked and cleaned before heating the sauna stove. It is also recommended to inspect the condition of the chimney and the flue and to ask a specialist to clean them when necessary.