Troubleshooting

 

 

 

Table 25 Troubleshooting

 

 

 

 

Symptom

Possible Cause

Check Or Remedy

 

 

 

Cooling cycle too

Sensor response delay too short

Increase sensor response delay. See 6.11 - Calibrate Sensors.

short

 

 

Display freezes

 

During period of low humidity, static electricity can cause the

 

control program to freeze or display incorrect information.

and control pads

Static discharge

Although this is unlikely, the control can be reset by cycling

do not respond

 

 

power from the disconnect switch.

 

 

 

 

 

Condensate

 

 

pump does not

Open or short circuit in wiring

Find open or short circuit and repair power to pump.

operate

 

 

Continuous

 

Temperature display will indicate dashes. Check wiring from

Failed temperature sensor

temperature/humidity board (remote sensors) to the control

Cooling

board or from control board to wallbox. Replace

 

 

 

temperature/humidity circuit board (remote sensors) or wallbox.

 

 

 

Continuous

 

 

Heating

Shorted wiring or failed control

Check wiring and/or replace control board.

Dehumidification

board

 

Humidification

 

 

 

 

 

 

 

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

Display Problem

 

once every 10-12 sec. If T+ and T- are reversed, the POWER

Incorrect wiring

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.

65

Liebert® Mini-Mate2™

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Emerson MINI-MATE2 Symptom Possible Cause Check Or Remedy Cooling cycle too, Short, Display freezes, Control pads
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MINI-MATE2 specifications

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