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Troubleshooting
RH2 Faults
The self-diagnostic system built into the RH2 is continually monitoring the operation of the
humidifier. When an abnormal condition occurs that cannot be self-corrected by the software
the RH2 will turn off power to the cylinder, drain the cylinder, and annunciate the fault using the
yellow status LED.
LED Flash Sequence
To differentiate between different fault conditions the yellow LED is flashed in different
sequences. Table 8 lists the fault sequences that can be displayed, their meaning, possible
cause and suggested corrective actions.
Clearing a Fault
Check the flash sequence against the list of fault messages and take any necessary actions
to correct the cause(s) as outlined in Table 8: Troubleshooting RH2 Faults.
Power cycle the humidifier with the On/Off switch waiting 10 seconds between turning it off
and on. If an externally powered 0-10V controller is used, it must be turned off prior to
clearing the fault.
Table 8: Troubleshooting RH2 Faults
Yellow LED
System Detected
Cause
Corrective Action(s)
1 flash
Excess Current
Current has exceeded
130% of max
1 Drain blocked water over
concentrated
1 Clean the drain line
2 Drain solenoid not energized,
water over concentrated
2 Check and correct wiring to
drain valve.
3 Filling too fast, fill valve
damaged and leaking
3 Replace the fill valve
4 Filling too fast, wrong fill valve 4 Check for correct fill valve in
parts list, replace if incorrect
5 Water supply too conductive
5a Contact Nortec
representative for
recommendation on alternate
cylinder
5b Change the water supply
6 Humidifier short cycling
6a Check if high limit or other
On/Off control is cycling
On/Off in less than 5
minutes. Check location and
setting of high limit.
6b Reduce the output by
turning down the capacity
potentiometer.
7 Wrong cylinder installed
7 Install correct cylinder model
8 Cylinder Spent but not
detected by software
8 Replace the cylinder (see
maintenance chapter)
9 Condensate from other
source
9 Remove condensate returns
other than from steam line.
10 Back pressure
10 Eliminate back pressure
