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Troubleshooting
65 Liebert
®
Mini-Mate2
™
Cooling cycle too
short
Sensor response delay too short Increase sensor response delay. See 6.11 - 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.
Display Problem Incorrect wiring
Review 5.4.4 - Electrical Connections. Verify VDC between 5
to 6 Volts at TB-3 Pin 1 (Ground) and TB-3 Pin 2 of the control
board and wall box. If the transmit lines (TB-3 Pin 3 & 4) are not
connected, only the POWER LED will be lit. It will flash once
every 10-12 sec. If T- is connected, but not T+, TX1 will flash
approximately every 2-3 sec. And the POWER LED will flash
once every 10-12 sec. If T+ and T- are reversed, the POWER
LED and RX1 Will be lit and flash every 10-12 sec.
NOTE: Erratic operation of the unit could occur. If no LED is lit,
there is no power or the +5VDC polarity is reversed. If any of
these conditions occur, remove power from the evaporator using
the disconnect switch, and correct wiring from the control board
to the wall box.
NOTE: It may take up to 20 seconds for the display to appear on
the wall box LCD after power is applied.
Table 25 Troubleshooting
Symptom Possible Cause Check Or Remedy