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Humidifier
Liebert
®
CRV
™
122
Table 31 Humidifier troubleshooting
Unit Status Lamp
Symptom Corrective actions Yellow Green
On On
Maximum water level inside
cylinder.
This usually happens on initial start-up after replacing the
cylinder (normal). Water is concentrated with minerals
inside the cylinder. Let unit run; yellow light will disappear
when the unit is at full output. This may take a day or two.
Off Off No power to the board.
Check for main power supply fault. Turn power switch to
'Drain' position. If drain valve is activated (sound of
solenoid), check connection to the board or board itself.
When no sound is present, check fuse (replace with 3.0 A if
needed), transformer (voltage should be present between
fuse holder and ground screw).
1 flash
sequence
Off
Excess current. Operating
amperage exceeded 130% of rated
amps. Water is drained from the
cylinder (drain valve on for 10
minutes).
Check drain valve operation, drain time, possible drain
restrictions. Check fill valve for leaks (not holding supply
water). Back pressure may also cause very conductive
water conditions. Was the humidifier short cycling? Check
for short cycling. Water conductivity too high.
2 flashes in
sequence
Off
No current detection for 30 minutes
with continuous call for humidity.
Check water level in the cylinder - should be more than 1/4
full. If not, check fill rate, 24 VAC voltage on fill valve
terminals (unit must be on with call for humidity - green light
on steadily). Verify fresh water supply to the humidifier.
Leaking drain valve may be at fault (minerals blocking the
plunger). If cylinder is more than 1/4 full, check primary
power, connections to the cylinder, continuity of wires to
cylinder. Are power wires connected to proper terminals on
the cylinder? (Color coding.) Possibly wrong cylinder type.
Low water conductivity.
4 flashes in
sequence
Off
End of cylinder life - change
cylinder.
Check water level in the cylinder; should be about 3/4 full.
Check for foaming if water level is lower or cylinder life
shorter than expected. Change cylinder, clean drain valve.