38
TROUBLE SHOOTING - SYMPTOM, CAUSE AND ACTION
(Continued)
SYMPTOM
CAUSE
ACTION
Water doesn’t fill into
cylinder
Confirm that indicators for the four basic controls
all have green checkmarks in the “Steam” menu,
and the humidifier is switched ‘On’.
If all four control requirements are checked green,
consult the “Controls” section of the IOM.
If all four control requirements are checked green,
and the ‘Steam’ indicator is not red, check the
service required page for a possible shutdown
scenario.
If no service required information is available,
check the Fill Valve indicator (the blue LED on the
front). If the LED is on, check for 24VAC at the coil
of the fill valve. If 24VAC is present water should
be flowing if water is available. Be sure all shut off
valves ahead of the humidifier are open.
If water is available, check the fill valve strainer
for sediment. The strainer may be checked by
removing the plastic nut from input side of the valve
and reaching inside the housing with a non-sharp
tool and pulling the strainer out.
If 24VAC is present and strainer is clean, the fill
valve may be defective.
If the High Water Sensor is activated, the fill valve
will not be allowed to open. In this case the blue
LED on the front panel will be off.
Make sure the drain solenoid is not partially open
due to blockage, restriction, or malfunction.
Drains continuously
The most common cause is to have a piece
of mineral in the drain solenoid valve that prevents
the valve from closing properly. Simply cycling the
“On-Off-Drain” switch back and forth between “Off”
and “Drain” may dislodge the sediment. In extreme
cases it may be necessary to disassemble drain
lines to clean them. If mineral buildup is a reoccur-
ring issue, make sure the “Repetitive Drain Valve”
option is enabled in the settings menu.
Check movement of the solenoid actuator to verify
that the plunger moves freely in the coil. If the coil
has overheated so that movement of the plunger is
restricted, it will require replacement of the valve.
When the Drain Valve” Red LED is lit, the circuit
board is sending 24VDC to the drain valve. If the
Red LED is on but 24VDC is present at the drain
valve, the circuit board may be defective.
