Troubleshooting

Table 27 Steam generating humidifier troubleshooting

 

 

 

Symptom

Possible Cause

Check or Remedy

 

 

 

 

 

Check drain valve to ensure that it drains freely. Check and

 

 

replace if defective.

 

Foaming

 

False canister full indication

Check water supply. If commercially softened, reconnect to

 

 

raw water supply. If connected to hot water reconnect to

 

 

cold water.

Main 24 VAC fuse or circuit

Shorts or loose connections

Check the wiring connections of the 24 VAC circuit.

breaker trips

Faulty circuit board

Replace the circuit board.

 

 

 

Main fuses blow

Faulty solenoid

Check for magnetic field at coil.

approximately 15 seconds

Conductivity too high

Check amp draw of humidifier on startup. If it exceeds rated

after unit is activated

amps, increase setting of the % pot on the circuit board

 

 

 

 

Mineral deposits obstruct

Check drain valve for obstructions and clean if necessary.

Main fuses blow when

drain valve

 

drain valve is activated.

Faulty solenoid

Check for magnetic field at coil.

 

 

 

 

Faulty circuit board

Replace circuit board.

 

 

 

 

 

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

 

 

 

Unit ON, humidifier will not

Humidifier not receiving power

Check fuses or CBs and replace or reset if necessary.

operate

 

 

Make sure molex connector is securely plugged into circuit

 

 

 

 

board and that no wires are loose.

 

 

 

 

No water available to unit

Check external shut-off valves.

 

 

 

Contactor pulled in, but no

Clogged fill line strainer

Clean or replace fill line strainer.

 

 

Wiring breaks or loose

 

water enters canister

Check for faulty wiring and loose connections.

 

connections

 

 

Faulty circuit board

Replace circuit board.

 

 

 

 

Foaming

Check drain valve and water supply.

 

 

 

 

 

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 block. L2 must also

 

 

be connected to the electrode closest to the steam outlet

 

Canister interface connections

port.

 

incorrect

Verify that the red wire from terminal #2 on the interface

 

 

Water enters canister, but

 

connects to the red top terminal on the canister. This is the

canister full circuit activates

 

one farthest from the steam outlet port and is the high water

at a low water level

 

sensor probe.

 

 

Remove red canister full wire from canister. If normal

 

Full isolation has broken down

operation resumes, canister must be replaced. Remove the

 

wire from terminal #3 on the interface. If normal operation

 

 

 

 

resumes, canister full interface must be replaced.

 

 

 

 

Drain assembly not operating

Check and replace coil or valve if necessary.

 

freely

 

 

 

Faulty circuit board

Replace circuit board

 

 

 

Canister fills but overflows

Canister full circuit does not

Check wiring of canister full interface. Replace circuit board.

activate

 

 

62

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Liebert 3000 manual Steam generating humidifier troubleshooting

3000 specifications

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