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Troubleshooting
General Troubleshooting
The following section provides general guidelines for troubleshooting the RH2 humidifier and
auxiliary components. For detailed troubleshooting information refer to the manuals that were
provided with the auxiliary equipment and to Table 8: Troubleshooting RH2 Faults after in this
chapter.
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 RH2 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 air proving
safety loop, terminal 1 and 8.
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 RH2 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.
7 No airflow in duct
7 Check that humidifier fan enable
(terminals 19-20) are properly wired to
furnace. Check air proving wired to
terminal 8.
Humidifier has faulted and
yellow LED is flashing
1 Software has detected an
abnormal condition
1 Refer to Table 8: Troubleshooting RH2
Faults.
