Stulz DAH - Troubleshooting and Repair

22
Series GEN 2 Ultrasonic Humidifier IOM Manual
Troubleshooting and Repair
Should any issues occur, see the troubleshooting and repair tables below to resolve the issue.
WARNING
Turn off power when undertaking any repairs.
Check the humidifier and the surrounding area.
Issue Cause Checking Remedy
No mist is
generated.
Power supply
system
Control box switch
turned off.
Visually check switch
position.
Turn switch on.
No power to the
power supply.
Measure the voltage at
power supply input
terminals.
Measure the voltage
at power supply
output
terminals.
Faulty power supply.
Measure the voltage at
power supply output
terminals.
Replace the power
supply.
Water supply
system
Water supply valve
is closed.
Check if the valve is
opened or closed.
Open the valve.
Other
Temperature sensor
detects overheating.
Check if ambient
temperature and water
temperature are within
specified range.
Correct.
Amount of mist is
too low.
Power supply
system
Supply voltage is
low.
Check voltage at power
supply output terminals
while operating the
humidifier at 100%
capacity.
Correct the voltage
with the adjustment
screw on the power
supply.
Water supply
control system
Operating water
level is high and
overflowing.
Visually inspect.
See Table 3) on next
page.
Other
Humidifier is not
level.
Visually inspect. Adjust.
‡ Air filter clogging
Mist supply is
coarse.
Power supply
system
Supply voltage is
high.
Check voltage at power
supply output terminals
while operating the
humidifier at 100%
capacity.
Fine tune the mist
quality with the voltage
adjustment screw on
the power supply.
If the cause cannot be located, remove the mist guide cover and air flow guide and check
the interior of the water tank.
The causes of issues marked ‡ can be prevented through periodic maintenance/inspection.