47 | Troubleshooting
General Troubleshooting
The following section provides general guidelines for troubleshooting the RH humidifier and
auxiliary components. For detailed troubleshooting information refer to the manuals that were
provided with the auxiliary equipment and to Table 8: Troubleshooting RH Faults after in this
chapter.
Humidifier
Table 7: General Troubleshooting
Symptom Cause Corrective Action(s)
Nothing happens when On/Off
switch is turned on.
1 Fuse blown 1 Check inline fuse between transformer
and control board.
2 Incorrect Voltage 2 Check voltage against spec label and
correct.
3 Step Down Transformer not
outputting 24VAC
3 Replace the transformer
4 Incorrect primary power jumper 4 Check that jumper on high voltage
terminal block is connected between P
and terminal corresponding to supply
voltage.
Humidifier will not humidify or
not reaching RH setpoint
1 Safety loop open
1a Check if there is 24 VAC at terminal
2.
1b Check wiring and operation of On/Off
devices connected to terminal 1 and
2.
1c Check jumper is installed in fan
safety loop, terminal 8 and 9.
2 No demand signal
2 Check voltage between terminal 3 and
4. For demand configuration 35% of
full-scale signal must be present for
humidifier to start.
3 Not configured correctly for
On/Off or modulating control
3 Check that J10 on control board is
removed for modulating control and
installed for On/Off control.
4 Capacity has been manually
limited
4 Check Manual Capacity adjustment
potentiometer. Clockwise increases
capacity.
5 Low conductivity water 5 Check if yellow LED is on. If operated
on low conductivity water it may take
several hours for the RH to reach full
output capacity. This is normal.
During this time the humidifier will not
perform any drains and the
conductivity of the water in the
cylinder will increase.
6 Incorrect configuration
(Modulating or On/OFF)
6 Check J10 on control board, remove if
a modulating humidistat is being used.
Humidifier has faulted and
yellow LED is flashing
1 Software has detected an
abnormal condition
1 Refer to Table 8: Troubleshooting RH
Faults.
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