Emerson MINI-MATE2 user manual 11.0TROUBLESHOOTING, Troubleshooting, Liebert Mini-Mate2

Troubleshooting

11.0TROUBLESHOOTING

Table 25 Troubleshooting

Symptom	Possible Cause	Check Or Remedy
	No power to unit	Check voltage at input terminal block.
	Control voltage circuit breaker (at	Locate short and reset circuit breaker.
	transformer) open
	Float switch relay closed	Has rubber band been removed from float switch? Check drain
Unit will not start	because of high water in the	and line. Access through left panel. Power must be cycled at the
	condensate pan	disconnect to reset.
		Check terminal TB1-4 and TB1-5 for jumper or N/C contact.
	Jumper not in place	Check pins 1-8 and 1-9 for jumper or N/C high temperature
		sensor contact. Check pins 5-4 and 5-5 for jumper or N/C smoke
		sensor contact.
	Cooling not displayed at the	Adjust TEMP control set point and sensitivity to require cooling.
	control panel
	Short cycle prevention control	Control software delays compressor 3 minutes cooling, from stop
		to start
	Compressor contactor not pulling	Check for 24 VAC ± 2 VAC at terminals P4-8 and P4-4. If voltage,
		check contactor. If no voltage at P4-8 and P4-4, check at
No cooling	in
		terminals P2-3 and P2-8. If voltage, check freeze stat.
	Compressor high head pressure	See below for cause.
	Plugged filter/dryer	Replace filter/dryer
		Check pressure gauges. At low ambient temperatures, proper
	Low refrigerant charge	refrigerant charge is very important on units with Lee-Temp
		receivers.
	Insufficient air flow across	Remove debris from coil and air inlets.
	condenser coil
Compressor high
	Water/Glycol Cooled only: No
head pressure		Check fluid supply to regulating valve. Adjust valve if necessary.
	fluid flowing through condenser
	Condenser fan not operating	Check fan operation.
	DIP switch not set to enable	See DIP switch settings Table 24.
	humidifier option
	“HUMIDIFY” not displayed at	Increase humidity control set point and sensitivity to require
	control panel	humidification.
		Check voltage at P3-1 and P1-9 on interface board for 24 VAC
	Defective board	± 2 VAC. If no voltage, check wiring and/or replace board. Check
		wiring from control panel to board.
Humidifier does
		Humidity display will indicate dashes. Check wiring from
not operate	Failed humidity sensor	temperature/humidity board to the control board and from the
		wall box to the control board. Replace wallbox or
		temperature/humidity circuit board (if remote).
		Make sure switch is in Run position. Check humidifier water
	No water flow	supply (including filter screen) and check nylon overflow line if
		canister is full.
	Canister fill rate is not keeping up	Check fill valve screen opening and capillary tube for
	with the steam output	obstructions. Check water supply pressure (minimum 10 PSIG).
	DIP switch not set to enable	See DIP switch settings Table 24.
	reheat option
	HEAT not displayed at the	Increase temperature set point to require heating.
Reheat will not	control panel
operate
	Reheat safety open, defective	Check voltage at P2-1 and P1-9 on interface board for 24 VAC ±
		2 VAC. If voltage, check reheat contactor and reheat safety. If no
	reheat contact or defective board
		voltage, check wiring and/or replace board.
	Element is burned out	Turn off power. Check element continuity with an Ohmmeter.

Liebert® Mini-Mate2™ 64