Chapter 7 Troubleshooting - Emerson DataMate 3000 Series User Manual

Symptom
No power to system
Control voltage circuit breaker (at
transformer) open
Unit will not start
Float switch relay has closed due to
high water level in the condensate
pump sump
Jumper not in place
Compressor contactor not pulling in
Compressor high head pressure
No cooling
Plugged filter/drier
Low refrigerant charge
Insufficient air flow across condenser
coil
High pressure alarm
Condenser fan not operating
Humidify function disabled
No humidify demand from the
Humidifier does not
controller
operate
Humidity sensor failure
Heat function disabled
Heater does not
No heat demand from controller
operate
Elements is burned out
Static discharge
Display abnormal
Loose connection between keypad
and control board
No display and Connection between keypad and
control pads do not control board open
respond. Equipment
Keypad failure
operates normally

Chapter 7 Troubleshooting

Possible cause
DataMate 3000 Series Air Conditioner User Manual
Chapter 7 Troubleshooting
Check or remedy
Check voltage at input terminal block
Locate short and reset circuit breaker
Check drain and line as well as for failed pump
Check jumpers on the interface board
Check for 24Vac ± 2Vac at terminal J74 on the
interface board. If voltage, check contactor
See "High pressure alarm" for cause
Replace filter/drier
Check pressure gauges. Check if there is
evident bubbles from the sight glass
Remove debris from coil and air inlet
Check fan operation
Set "Humidity" to OPEN, refer to section 5.9.2
Increase humidity control setpoint and sensitivity
to require humidification
Humdity display will indicate dashes. Check
wiring from temperature/humidity board to the
control board
Set "Heat" to OPEN, refer to section 5.9.2
Increase temperature setpoint to erquire heating
Trun off power. Check element continuity with
Ohm meter
Disconnect the system power, and then restart
Connection tightening after power off, and then
restart
Check the connection between keypad and
control board
Replace the keypad
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