Lennox Core Unit Controller User Manual

46
Table 11. CORE Control System Alarm and Event Codes
SELECTED ALARMS (MARKED WITH * IN TABLE RESULT IN THE CLOSURE OF THE SERVICE RELAY CONTACTS (DO1).
ALARM
CODE
DISPLAY MESSAGE EVENT ACTION
188 INVERTER MAJOR
• Alarming Value = Inverter error code
• Possible alarming values for unit controller alarm 188 are:
> 21 - Peak DC current
> 22 - Maximum current reached lockout
> 23 - DC Link low voltage
> 26 - Locked Rotor
> 28 - DC Link high voltage
> 29 - Compressor over current
> 61 - Low outdoor ambient inverter lockout
> 62 - High Heat Sink Temperature lockout
> 75 - Low Input Voltage
• No action required. Compressor stops for the duration of the minimum run time. Unit
shuts down after ten occurrences in one hour and Alarm 189 is initiated. Alarm 188
will automatically clear when inverter error clears.
• Refer to trouble shooting guide in service manual for more information.
189 INVERTER FATAL
• Alarming Value = Inverter error code
• Possible alarming values for alarm 189 are 21, 22, 23, 26, 28, 29, 61, 62 and 75.
• Alarm 189 will clear upon manual reset.
• Refer to trouble shooting guide in service manual for more information.
190 INVERTER COMM
Unable to communicate with inverter. The unit controller will disable compressor operation.
Replace communication cable between inverter and CORE Unit Controller. If alarm
continues, replace CORE Unit Controller or inverter.
191 INVERTER VOLTAGE MISMATCH The unit controller will disable compressor operation. Replace with correct inverter part.
192 HIGH TEMP S7 OPEN COMP1
Check temperature trip switch. Compressor is off. Also check charge, fans and coil. The
unit controller will clear the temperature trip alarm when corresponding compressor top
cap temperature trip switch is detected as closed. Compressor will not restart until the
corresponding temperature trip switch is closed and the minimum off delay has expired.
193 STRIKE3 HIGH TEMP S7 OPEN COMP1
The unit controller will disable compressor operation (lockout). Check switch, charge, fans
and coil. Default is three occurrences. Alarm will be automatically cleared after removal of
cooling demand.
194
CRITICAL LOSS CONDENSER
AIRFLOW
CriticalLossofCondenserAirow
195 C1 CRITICAL LOSS OF CHARGE
Critical Loss of Charge Compressor 1. In Model L this is determined by temperature
readings from sensors on the coils.
196 C2 CRITICAL LOSS OF CHARGE
Critical Loss of Charge Compressor 2. In Model L this is determined by temperature
readings from sensors on the coils.
197 C3 CRITICAL LOSS OF CHARGE
Critical Loss of Charge Compressor 3. In Model L this is determined by temperature
readings from sensors on the coils.
198 C4 CRITICAL LOSS OF CHARGE
Critical Loss of Charge Compressor 4. In Model L this is determined by temperature
readings from sensors on the coils.
199
CRITICAL LOSS OF EVAPORATOR
AIRFLOW
CriticalLossofEvaporatorAirow
200 C1 NON OPERATING COMPRESSOR Compressor 1 Not Operating
201 C2 NON OPERATING COMPRESSOR Compressor 2 Not Operating
202 C3 NON OPERATING COMPRESSOR Compressor 3 Not Operating
203 C4 NON OPERATING COMPRESSOR Compressor 4 Not Operating
204 C1 TXV FAILED CLOSED Compressor 1 TXV Failed Closed
205 C2 TXV FAILED CLOSED Compressor 2 TXV Failed Closed
206 C3 TXV FAILED CLOSED Compressor 3 TXV Failed Closed
207 C4 TXV FAILED CLOSED Compressor 4 TXV Failed Closed
208 C1 MAJOR LOSS CHARGE Major Loss of Charge Compressor 1
209 C2 MAJOR LOSS CHARGE Major Loss of Charge Compressor 2
210 C3 MAJOR LOSS CHARGE Major Loss of Charge Compressor 3
211 C4 MAJOR LOSS CHARGE Major Loss of Charge Compressor 4

Lennox Core Unit Controller Specifications

General

Brand	Lennox
Model	Core Unit Controller
Category	Controller
Language	English