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Troubleshooting
Liebert
®
Mini-Mate2
™
64
11.0 TROUBLESHOOTING
Table 25 Troubleshooting
Symptom Possible Cause Check Or Remedy
Unit will not start
No power to unit Check voltage at input terminal block.
Control voltage circuit breaker (at
transformer) open
Locate short and reset circuit breaker.
Float switch relay closed
because of high water in the
condensate pan
Has rubber band been removed from float switch? Check drain
and line. Access through left panel. Power must be cycled at the
disconnect to reset.
Jumper not in place
Check terminal TB1-4 and TB1-5 for jumper or N/C contact.
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.
No cooling
Cooling not displayed at the
control panel
Adjust TEMP control
set point and sensitivity to require cooling.
Short cycle prevention control
Control software delays compressor 3 minutes cooling, from stop
to start
Compressor contactor not pulling
in
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
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
Low refrigerant charge
Check pressure gauges. At low ambient temperatures, proper
refrigerant charge is very important on units with Lee-Temp
receivers.
Compressor high
head pressure
Insufficient air flow across
condenser coil
Remove debris from coil and air inlets.
Water/Glycol Cooled only: No
fluid flowing through condenser
Check fluid supply to regulating valve. Adjust valve if necessary.
Condenser fan not operating Check fan operation.
Humidifier does
not operate
DIP switch not set to enable
humidifier option
See DIP switch settings Table 24.
“HUMIDIFY” not displayed at
control panel
Increase humidity control
set point and sensitivity to require
humidification.
Defective board
Check voltage at P3-1 and P1-9 on interface board for 24 VAC
± 2 VAC. If no voltage, check wiring and/or replace board. Check
wiring from control panel to board.
Failed humidity sensor
Humidity display will indicate dashes. Check wiring from
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).
No water flow
Make sure switch is in Run position. Check humidifier water
supply (including filter screen) and check nylon overflow line if
canister is full.
Canister fill rate is not keeping up
with the steam output
Check fill valve screen opening and capillary tube for
obstructions. Check water supply pressure (minimum 10 PSIG).
Reheat will not
operate
DIP switch not set to enable
reheat option
See DIP switch settings Table 24.
HEAT not displayed at the
control panel
Increase temperature
set point to require heating.
Reheat safety open, defective
reheat contact or defective board
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
voltage, check wiring and/or replace board.
Element is burned out Turn off power. Check element continuity with an Ohmmeter.