Troubleshooting|
52
Table 8: Troubleshooting RH2 Faults (Continued)
Yellow LED
System Detected
Cause
Corrective Action(s)
2 flashes
No Current
Fill valve activated for
long time but high water
level not reached.
Fill should be faster than
1” per minute.
1 Drain valve leaking or stuck
open
1 Clean drain valve or replace
(see maintenance chapter)
2 Water shut off valve closed
2 Open shut off valve
3 Fill Valve strainer blocked
3 Clean out strainer on fill valve
inlet.
4 High system back pressure
4a Check for kinked hose
4b Check for proper
condensate removal (see
installation chapter)
4c Install fill cup extension
5 High water sensor not
connected
5 Check that cylinder plug with
white marker is connected to
short electrode with a plastic
well around it and to control
board.
6 Low water conductivity
6a Check if potable water
supplied to unit, not treated
water (RO or DI) .
6b Check conductivity of water.
If less than 150 µS/cm.
6c Add 1/4 teaspoon of salt to
fill cup and restart unit.
3 flashes
No Current, High Water
Water level at top of
cylinder with no current
1 Primary wire not looped
through current transformer.
1 Open disconnect, rewire
primary wire through current
transformer.
2 High water sensor plug is on
an electrode pin.
2 Install high water senor plug
on cylinder pin with shroud
around it.
3 Cylinder plugs installed
incorrectly
3 Check that cylinder plugs
colors match markers next to
electrodes on cylinder and
that white marked cylinder
plug is connected to short
electrode located in plastic
well.
4 flashes
Cylinder Spent
Electrodes covered with
scale.
1 Cylinder electrodes are
covered with scale and
humidifier cannot meet
demand
1 Replace cylinder with same
model number (see
maintenance chapter).
In order to clear “spent
cylinder” fault codes,
externally powered
modulating controllers will
have to be turned off before
power cycling the unit.
