Troubleshooting

Table 26 Humidifier—steam generator troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

 

 

Check drain valve to ensure that it drains freely. Check

False canister full

 

and replace if defective.

Foaming

 

Check water supply. If commercially softened,

indication

 

 

reconnect to raw water supply. If connected to hot

 

 

water reconnect to cold water.

Main 24 VAC fuse or

Shorts or loose connections

Check the wiring connections of the 24 VAC circuit.

circuit breaker trips

Faulty circuit board

Replace the circuit board.

 

 

 

 

 

Verify that RUN/DRAIN switch is in the RUN position.

 

 

 

Unit ON, humidifier will

Humidifier not receiving power

Check fuses or CBs and replace or reset if necessary.

not operate

 

 

Make sure molex connector is securely plugged into

 

 

 

 

circuit board and that no wires art loose.

 

 

 

 

No water available to unit

Check external shut-off valves.

Contactor pulled in, but

 

 

Clogged fill line strainer

Clean or replace fill line strainer.

no water enters

 

 

Wiring breaks or loose connections

Check for faulty wiring and loose connections.

canister

 

Faulty circuit board

Replace circuit board.

 

 

 

Water enters canister,

 

 

but canister full circuit

Foaming

Check drain valve and water supply.

activates at a low water

 

 

level

 

 

 

 

 

 

 

Check connection on component plate in humidifier

 

 

cabinet Terminal #1 on the square block interface

 

 

device must be connected to L2 of the power terminal

 

Canister interface connections

block. L2 must also be connected to the electrode

 

closest to the steam outlet port.

 

incorrect

 

Verify that the red wire from terminal #2 on the

 

 

Water enters canister,

 

interface connects to the red top terminal on the

 

canister. This is the one farthest from the steam outlet

but canister full circuit

 

port and is the high water sensor probe.

activates at a low water

 

 

 

Remove red canister full wire from canister. If normal

level

 

 

 

operation resumes, canister must be replaced.

 

Full isolation has broken down

Remove the wire from terminal #3 on the interface. If

 

 

normal operation resumes, canister full interface must

 

 

be replaced.

 

Drain assembly not operating freely

Check and replace coil or valve if necessary.

 

 

 

 

Faulty circuit board

Replace circuit board

 

 

 

Canister fills but

Canister full circuit does not activate

Check wiring of canister full interface. Replace circuit

overflows

board.

 

Humidifier contactor is

Cylinder full. Interface activated.

See similar symptoms above. Canister expired.

not pulled in (to reset,

 

Replace canister.

de-energize control

Problem with fill water system

Water supply is not on. Fill valve problem. Drain valve

unit)

stuck open.

 

 

 

 

 

Canister expired. Replace canister. DIP switch

 

 

settings changed with water in canister. Drain canister,

 

 

call Liebert service.

 

Humidifier amps reached 138% of full

Humidifier fill valve stuck open; check valve. Water

Red LED on humidifier

load

conductivity too high; check water conductivity/quality.

control board is on.

 

Contact Liebert service.

Humidifier contactor not

 

DIP switches set incorrectly. Refer to Circuit Board

pulled in (to reset, de-

 

Adjustments on page 62

energize control circuit)

Mineral deposits obstruct drain valve

Check drain valve for obstructions and clean if

 

necessary.

 

 

 

Faulty solenoid

Check for magnetic field at coil.

 

 

 

 

Faulty circuit board

Replace circuit board.

 

 

 

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Emerson VH, DE, VE, DH manual Humidifier-steam generator troubleshooting, Adjustments on

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