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

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Emerson MINI-MATE2 user manual Troubleshooting
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MINI-MATE2 specifications

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