HNS Troubleshooting & Testing


WARNING! Steam generators may have several electric circuits. Make sure that the device is completely dead before any troubleshooting operations.

In case of malfunction check that:

  • the control panel and the steam generator are installed according to the connection diagrams
  • the steam generator is installed properly according to this instruction manual
  • the downpipe has adequate fall towards the drain
  • the dirt filter is clean. The filter is in the incoming water connector. Open the pipe connector for cleaning, remove the filter and remove all the chalk and dirt from it.
  • there are no water pockets in the steam pipe or in the outgoing air conditioning pipe.
  • there are no sharp bends in the steam pipe (bend radius must be at least 50 mm).
  • any tap on the incoming water pipe to the steam generator is open.
  • the steam room's structure and air conditioning match the installation and building instructions.

Troubleshooting chart
Possible causes and suggestions for fixes

Warming up takes abnormally long.

Cause: Inadequate power output of the steam generator. See output chart.
Action: Replace with more powerful steam generator.

Cause: Excessive ventilation of the steam room.
Action: Reduce ventilation so that it is 10-20 m³ per person per hour.

Cause: Blown fuse in the electrical cabinet
Action: Replace the fuse.
Action: Replace the heating element

Cause: The sensor is too close to the steam shower. See test 2.
Action: Move the sensor to another location or redirect the steam shower.

The steam room does not warm up or there is no steam.

Cause: Blown fuse in the electrical cabinet
Action: Replace the fuse.

Cause: No water is coming to the steam generator.
Action: Open the incoming water tap.

Cause: The control panel is not set up right.
Action: Check the time and temperature settings.

Cause: Dirt filter is blocked.
Action: Remove the dirt filter from the incoming water connector and clean it.

Cause: The electromagnetic valve for the incoming water is stuck.
Action: Remove the electromagnetic valve and clean it.

Cause: Too much chalk has accumulated in the steam generator's water tank. See test 1.
Action: Clean the water tank and surface sensor's pin, and replace the heating elements, if necessary.

Cause: The steam generator is connected for incorrect voltage.
Action: Check the voltage and the steam generator's connections. See Connection diagram.

Cause: The overheating protector has tripped. See test 4.
Action: Check and fix possible faults in the steam pipe, e.g. blocks caused by several sharp bends, water pockets or significantly reduces inner diameter of the pipe. It is also possible that the tank has been filled with chalk accumulation or impurities. See the previous entry.

Cause: Fault in the circuit board, control panel or electromagnetic valve.
Action: Replace the faulty part.

Warm water comes out of the steam nozzle, and there is little or no steam in the steam room.

Cause: The electromagnetic valve for the incoming water is stuck open because of dirt or electric fault. See test 3.
Action: Remove the electromagnetic valve and clean it. Fix the electric fault.

Cause: The electromagnetic valve is broken.
Action: Replace the electromagnetic valve.

Cause: Fault in circuit board.
Action: Replace the circuit board.

Warm water comes out of the steam nozzles in pulses or as weak continuous stream with steam.

Cause: Small water pocket in the steam pipe.
Action: Remove the water pocket.

Cause: Too much of the steam pipe is uninsulated.
Action: Insulate the steam pipe.

Warm water comes out of the steam generator's downpipe all the time.

Cause: Automatic electromagnetic flushing valve is stuck open.
Action: Stop the steam generator. Try again after 80 minutes. If the fault remains, remove the automatic electromagnetic flushing valve and clean it.

Banging noise from the water pipes when the electromagnetic valve opens or closes.

Cause: Inadequate connection in the water pipe coming into the steam generator.
Action: Mount the water pipe securely on the wall.

Cause: Recoil effect in the incoming water pipe.
Action: Install about 1 metre of pressure-proof reinforced rubber hose into the steam generator end of the water pipe.

Cause: Excessive water pressure(over 3 bar)
Action: fit pressure restricting valve

Safety valve opens or the overheating protector trips.

Cause: Steam pipe is blocked. See test 4.
Action: Remove the block.

Cause: The inner diameter of the steam pipe is significantly reduced. See test 4.
Action: Replace the pipe or the connection where the inner diameter is reduced (minimum inner diameter is 16 mm).

Cause: Several sharp bends in the steam pipe. See test 4.
Action: Make the bends less sharp.

Cause: There is a large water pocket in the steam pipe. See test 4.
Action: Install the steam pipe so that a water pocket does not form.

Steam generation is irregular from the beginning.

Cause: The sensor is misplaced. See test 2.
Action: Move the sensor or redirect the steam shower.

Cause: Chalk or other impurities in the dirt filter.
Action: Remove the dirt filter and clean it.

Checking chalk deposits in the water tank.
Remove hexagonal nut and using a torch inspect the condition of the tank. If chalk or scale is evident it is possible that the flushing and rinsing automation is not working. Check that the steam generator power has not been switched off after bathing with a switch that may fitted in the supply line. You can switch the power off from this switch only 80 minutes after the control panel has switched the power off. Check the automatic flushing function by setting a bucket with a volume of about 12 litres under the downpipe. Start the steam generator for about 15 minutes. Switch off the steam generator exactly the same way you normally do after bathing. Wait at least 80 minutes and check if the bucket is filled with water. If it is not filled, there is a problem with the steam generator's electric connections or the power supply has been switched off on the wire from electrical cabinet directly to steam generator. It is also possible that the exhaust valve is blocked or the circuit board is faulty.

Checking the thermostat sensor.
Wet a small towel with water and hang it on the sensor. If the steam generator starts producing steam within 20 minutes, the sensor works. However, it is placed in a wrong place or the temperature setting is too low. If the steam production does not start, use the troubleshooting chart to find the fault.

Checking the electromagnetic valve.
Stop the steam generator from the control panel. If water still flows from the steam nozzles 10 minutes after the power has been switched off from the control panel, there is dirt in the electromagnetic valve. Remove the electromagnetic valve and clean it. If the water flow stops within 10 minutes after the power has been switched off from the control panel, the fault is in the electrics (faulty connection or circuit board). It is also possible that too much chalk has accumulated in the water tank. See test 1.

Checking the steam pipe using the safety valve or the overheating protector.
Remove the steam pipe from the steam generator. Start the generator and let it run for about one hour. If the safety valve or the overheating protector does not trip during the test, there is a block in the steam pipe that prevents the steam flow. Follow the instructions in the troubleshooting chart.

The product’s warranty will be void if the steam generator has been incorrectly installed or it has been used in a manner other than described in the user manual. The warranty also expressly excludes operational faults if they are caused by hard water i.e. water with high levels of chalk, or otherwise impure water. The steam generator must be maintained as described in the user manual.