Liebert 50 & 60Hz - Manual (Page 67)

Troubleshooting
59
Cooling cycle too
short
Sensor response delay too
short
Increase sensor response delay. See 3.12 - Calibrate Sensors.
Display freezes
and control pads
do not respond
Static discharge
During period of low humidity, static electricity can cause the control
program to freeze or display incorrect information. Although this is
unlikely, the control can be reset by cycling power from the disconnect
switch.
Condensate
pump does not
operate
Open or short circuit in
wiring
Find open or short circuit and repair power to pump.
Continuous
Cooling
Failed temperature sensor
Temperature display will indicate dashes. Check wiring from
temperature/humidity board (remote sensors) to the control board or
from control board to wallbox. Replace temperature/humidity circuit
board (remote sensors) or wallbox.
Continuous
Heating
Dehumidification
Humidification
Shorted wiring or failed
control board
Check wiring and/or replace control board.
Table 18 Troubleshooting (continued)
Symptom Possible Cause Check or Remedy