HM750A1000
33-00289—01 26
Fault 3
flashes
Insufficient
Current
Fill valve activated
for long time, but
high water level not
reached.
Fill should be
faster than 1 in. per
minute.
Cylinder plugs installed incorrectly Check that cylinder plugs are completely seated
on cylinder.
Fill valve inlet filter clogged Check fill valve inlet filter and clean if required.
Fault 4
flashes
PCB Error The control board detects current
draw when the humidifier is in
standby mode.
Replace circuit board.
Fault 5
flashes
Wrong Voltage
Selection
VOLTAGE SELECTION jumper on
control board is incorrectly set.
If 240VAC is supplied to the humidifier, but the
VOLTAGE SELECTION jumper is set to 120VAC,
the control board will fail and need to be
replaced.
If 120VAC supplied to the humidifier, but the
VOLTAGE SELECTION jumper is set to 240VAC,
the 5 flash fault will occur. Correct the VOLTAGE
SELECTION jumper and re-start humidifier.
Service LED Symptom Cause Corrective Action(s)
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