Vertiv | Liebert® DM | User Manual 104
Troubleshooting
Symptom Possible Cause User Needs to Check Particulars or Processing Method
Heater does not
function
Heat function disabled in Select
Options menu
Set the Heat optional function.
No heat demand output from the
control system
Adjust temperature setpoint and sensitivity within the
required range.
Heating element is burned out
Turn o the power supply. Check the element resistance
with a multimeter.
Display abnormal
Static discharge Disconnect the system power supply and then restart.
Loose connection between keypad
and control board
Check the connections are firmly fixed after powering o,
the unit and then restart the unit.
No display, control
buttons do not
respond and unit
operates normally
Disconnection between keypad and
control board
Check if the connections between keypad and control
board are firmly connected.
The screen display
is normal, the
button does not
respond, the device
is running normally
The display board setting is faulty
Contact Vertiv representative for maintenance support or
engineering assistance.
No display, control
buttons do not
respond and unit
has no output
Low power supply voltage Check for power supply voltage.
Communication between control
board and control board interrupted
Check if the connections between control board and
control board are firmly connected.
High pressure
alarm
Insuicient airflow across condenser
Remove debris from coil and airflow inlet and check the
fan speed function of the control board.
Condenser fan is not operating
Check that the connections of the control board to the
outdoor unit terminals are firmly connected. Check that
the condensate pressure sensor works normally.
High pressure switch failure
Check the connection of the high-pressure switch and the
on-o condition when the power is turned o. If necessary,
replace it with the high-pressure switch of the same
specification.
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