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Troubleshooting
Liebert
®
CRV
™
114
15.0 TROUBLESHOOTING
Table 29 Unit diagnostics
Problem
Possible Cause Corrective Action
Rack temperature
is too high
Dirty filters Replace filters
Filter clog sensor failure Call Emerson Network Power
Incorrect positioning of remote
temperature sensor(s)
Verify that remote temperature sensors are correctly
positioned
Remote temperature sensor(s) issue Contact Emerson
Condensing pressure (head pressure) is
too high
Air-cooled units: Verify that remote condenser fan(s) are
running
Water/glycol units: Check cooling water supply
Water/glycol units: Check cooling water temp
Call Emerson Network Power
Chilled water units: inlet water
temperature is too high
Check cooling water temperature
Refrigerating circuit charge issue Contact your local Emerson representative
Cold air short-cycling issues
Verify unit positioning/room configuration
Verify unit air baffles set-up
Verify cold aisle containment seals (if applicable)
Insufficient room-cooling capacity Reduce rack heat load or add cooling units
(C unit) water-regulating valve issue Contact your local Emerson representative
Unit safety devices intervention Contact your local Emerson representative
Unit fan fails
to start
Fan is faulty Contact your local Emerson representative
Water drops
carried by airflow
Room humidity is over acceptable limit Check room condition
Condensate pan drain is clogged Contact your local Emerson representative
Problem with humidifier control Contact your local Emerson representative
Water on the floor
around the unit
Unit is not properly levelled Adjust the levelling feet
Unit condensate drain pipe is clogged Remove pipe obstruction
Chilled water and water/glycol units: leak
in the water circuit
Locate and repair the leak
Piping insulation broken/damaged Restore insulation integrity
Leak in the draining circuit Contact your local Emerson representative
Condensate pump is faulty Contact your local Emerson representative
Leak in the humidifier filling hose Contact your local Emerson representative
Cooling unit
noise level
is higher
than expected
Incorrect positioning of remote
temperature sensor(s)
Verify correct positioning of temperature sensors
Unbalanced heat load distribution Redistribute rack heat load
Remote temperature sensor(s) issue Contact your local Emerson representative
Unsteady
air delivery
temperature
Faulty temperature sensor(s) Contact your local Emerson representative
Unit controller issue Contact your local Emerson representative
Local display is
not operational
but unit operates
Local display cable disconnected Connect cable
Local display cable damaged Replace cable
Local display configuration lost Contact your local Emerson representative
Local display is
not operational
and unit does not
operate
Unit electrical supply is Off Restore electrical supply
Unit main switch is Off Switch On the unit
Control board supply issue Contact your local Emerson representative
Control board issue Contact your local Emerson representative