Liebert Challenger 3000

Table 27Steam generating humidifier troubleshootingSymptom Possible Cause Check or RemedyFalse canister full indicationMain 24 VAC fuse or circuitbreaker tripsMain fuses blowapproximately 15 secondsafter unit is activatedMain fuses blow whendrain valve is activated.Unit ON, humidifier will notoperateContactor pulled in, but nowater enters canisterWater enters canister, butcanister full circuit activatesat a low water levelCanister fills but overflowsFoamingShorts or loose connectionsFaulty circuit boardFaulty solenoidConductivity too highMineral deposits obstructdrain valveFaulty solenoidFaulty circuit boardHumidifier not receiving powerNo water available to unitClogged fill line strainerWiring breaks or looseconnectionsFaulty circuit boardFoamingCanister interface connectionsincorrectFull isolation has broken downDrain assembly not operatingfreelyFaulty circuit boardCanister full circuit does notactivateTroubleshootingCheck drain valve to ensure that it drains freely. Check andreplace if defective.Check water supply. If commercially softened, reconnect toraw water supply. If connected to hot water reconnect tocold water.Check the wiring connections of the 24 VAC circuit.Replace the circuit board.Check for magnetic field at coil.Check amp draw of humidifier on startup. If it exceeds ratedamps, increase setting of the % pot on the circuit boardCheck drain valve for obstructions and clean if necessary.Check for magnetic field at coil.Replace circuit board.Verify that RUN/DRAIN switch is in the RUN position.Check fuses or CBs and replace or reset if necessary.Make sure molex connector is securely plugged into circuitboard and that no wires are loose.Check external shut-off valves.Clean or replace fill line strainer.Check for faulty wiring and loose connections.Replace circuit board.Check drain valve and water supply.Check connection on component plate in humidifier cabinet.Terminal #1 on the square block interface device must beconnected to L2 of the power terminal block. L2 must alsobe connected to the electrode closest to the steam outletport.Verify that the red wire from terminal #2 on the interfaceconnects to the red top terminal on the canister. This is theone farthest from the steam outlet port and is the high watersensor probe.Remove red canister full wire from canister. If normaloperation resumes, canister must be replaced. Remove thewire from terminal #3 on the interface. If normal operationresumes, canister full interface must be replaced.Check and replace coil or valve if necessary.Replace circuit boardCheck wiring of canister full interface. Replace circuit board.62