Liebert 50 & 60Hz Symptom Possible Cause Check or Remedy Cooling cycle too, Short, Control pads

Troubleshooting

Table 18 Troubleshooting (continued)

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

59