Stulz DAH - Page 28

23
Series GEN 2 Ultrasonic Humidifier IOM Manual
If the cause cannot be located through the above checking, parts may be faulty. Check the
interior of the humidifier.
Issue Cause Checking Remedy
No mist is
generated.
Water supply
control system
Water supply float
switch (FS1) is
faulty.
Drain the water tank,
remove the printed circuit
board terminal (X3) and
test the continuity of the
float switch.
If there is no
continuity, replace the
switch.
‡ Water supply float
switch sticking.
Clean the switch. If
operation is not
restored, replace
switch.
Water supply
solenoid valve is
faulty.
No supply water is
provided even if the water
tank is drained and
voltage between terminals
X2-1 & X2-2 on the
printed circuit board is
24VDC.
Replace the solenoid
valve.
Float switch for low
water level is faulty.
With the water tank filled
with water, remove the
wire from terminal (X3) on
the printed wiring board
and check continuity of
the float switch.
If there is no
continuity, replace the
switch.
‡ Float switch for
low water level is
sticking.
Clean the switch. If
operation is not
restored, replace the
switch.
Other
Lead wires are
loose or
disconnected from
the terminals.
Open the electrical
section and check the
lead wire connecting
terminals.
Reconnect or tighten
connections as
required.
Amount of mist is
too low.
Water supply
system
overflowing
Water supply float
switch is faulty.
If the water level in the
tank is up to the overflow
pipe, remove the wire
from terminal (X3) on the
printed circuit board and
ensure there is no
continuity on the float
switch.
If there is continuity,
re- place the switch.
‡ Water supply float
switch arm sticking.
Clean the switch. If
operation is not
restored, replace the
switch.
Water supply
solenoid valve is
faulty.
Overflowing occurs even
after power is turned off.
Replace the solenoid
valve.
Consumable Parts
Issue Cause Checking Remedy
No mist output, or
mist output is too
low.
Deterioration of transducer due to
aging.
The life is about 10,000 to
15,000 hours of humidifier
operation.
Replace the
transducer.
If the humidifier is operated for a long time with a deteriorated transducer, the nebulizer print plate may fail. The
transducers should be replaced using the estimated lifetime of 10,000 to 15,000 hours as the point of reference.
If the cause cannot be identified, contact Product Support. at (888) 529-1266 or email
TechnicalSupport@stulz-
ats.com.
If the humidification system is supplied with a water conductivity sensor (optional), ensure the sensor is operating
properly and that the supply water is within the recommended guidelines for mineral content.