Troubleshooting
69
Liebert
®
Mini-Mate2
™
11.0 T
ROUBLESHOOTING
Table 31
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 has
closed due to high water
in the condensate pan.
Has rubber band been removed from float switch? Check drain and line.
Access from bottom through discharge air gills. 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 detector contact.
No cooling
“Cooling” is not displayed
at the control panel.
Adjust TEMP control setpoint 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 freezestat.
Compressor high head
pressure.
See below for cause.
Plugged filter/drier.
Replace filter/dryer.
Low refrigerant charge.
Check pressure gauges. See
Table 11
and
Table 13
for recommended
pressures. 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.
Self-Contained, Air-
Cooled only: Condenser
fan not operating
Check fan operation.
Humidifier does not
operate
DIP switch not set to
enable humidifier option
See DIP switch setting
Table 30
.
“HUMIDIFY” not
displayed at control panel
Increase humidity control setpoint and sensitivity to require
humidification.
Defective board
Check voltage at P3-1 and P1-9 on interface board for 24VAC ± 2VAC. 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 wall box 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).
