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Problem / Symptom Probable Cause Reason - Correction
Dead short between electrodes.
Replace the steam cylinder. Check
resistance between electrodes with
power “off”
Restricted or blocked drain. Clean and inspect drain system.
Restricted fill system Clean and inspect the fill system.
Check for restriction or loss of supply
pressure.
Incoming water conductivity is outside
the range of normal circuit board
settings.
Consult the factory for options.
Overcurrent
The alarm condition occurs when an
overcurrent situation (>138% of rated
current) has occurred and the
humidifier has shut down to prevent
any damage. This alarm indicates that
there has been a significant reduction
in resistance between the main legs of
the supply power and the humidifier
has been shut down to prevent
damage and should be serviced
before it is restarted. Overcurrent LED
CR 17 (Figure 12) is illuminated.
Check amp draw to unit during start-
up. If amp draw greatly exceeds rated
amp draw, the drain threshold pot,
labeled “% adj.” (R18), must be
increased 2% to increase the
frequency and duration of drains to
reduce the conductivity inside the
cylinder.
Manually drain the unit and restart.
End of cylinder life – Cylinder life is
typically between 500 and 2000 hours,
depending on incoming water supply.
(See unit operation section for typical
cylinder life expectancy chart on Pg.
5).
For emergency use, you may restart
the humidifier with the capacity
setpoint, R39, at a lower level to allow
operation until a replacement steam
cylinder can be obtained. To clear the
fault, turn the main disconnect to the
unit “off” and then back “on”.
If incoming water supply is less than
100 micromho, the unit may not be
able to pass the rated current through
the water.
See – NON-FAULT ACTIVATED
PROBLEMS GUIDE – “Unit fills to the
cylinder full condition and remains
cold”
End of Cylinder
This alarm condition occurs if the
humidifier is unable to reach full output
over a 6-hour timeframe. It is
constantly switching between “fill” and
“cylinder full” modes. This alarm
indicates a need to change the
cylinder that the water supply is low in
conductivity that the water supply is
low in conductivity, or that a foaming
condition exists:
Foaming condition exists. Flush and fill the steam cylinder
several times and restart. If it persists,
you must filter or treat the water to
remove the foaming agent. See circuit
board settings on previous page if
supply water is softened. See NON –
FAULT ACTIVATED PROBLEMS
GUIDE – “Water foaming inside the
cylinder”
Loss of or restricted water supply Check fill system.
Leaking drain system. Check drain system.
Defective drain valve. Repair and replace as required.
Fill System Fault
This alarm condition occurs when the
fill valve has been energized for a 6-
hour timeframe. The humidifier has
been shutdown to prevent any
damage.
Defective fill valve. Repair and replace as required.
Unit Detected Faults: (Red “Service” Light On)
NOTE: The three fault conditions outlined above will cause the humidifier to shut down and the service light on the
front of the unit to illuminate. To clear these faults, the main power must be turned “off” and back “on” again.
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