Symptom Possible Cause Check or Remedy
Unit in call for humidification,
humidifier will not operate Humidifier not
receiving power
Verify ON/OFF/DRAIN switch is in ON position.
Check fuses or CB's and replace or reset if necessary.
Humidifier Contactor pulled in,
but no water enters canister
No water available
to unit
Check external water shut-off valves.
Clogged fill line
strainer
Clean or replaced fill line strainer
Excessive arcing in canister
Drain valve
clogged or
defective
Verify that drain valve operates freely when activated. Clean valve and replace if defective.
Flush canister several times and replace if arcing persists.
Improper water
supply
If water is commercially softened, reconnect humidifier to raw water supply, drain canister
and restart. If connected to hot water supply, reconnect to cold water.
Insufficient drain
rate
Verify that drain valve operates freely when activated. Clean valve and replace if defective.
Flush canister several times and replace if arcing persists.
Excessive mineral
content in water
Analyze mineral content of water. If mineral content is excessive contact Vertiv™ Technical
Support.
Table 9.5 Steam generating humidifier troubleshooting guide
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 81
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