Cooling Troubleshooting - Carrier 50PD05 Operating And Service Instructions

Table
8 -- ComfortLink T_Alarm Codes (cont)
ALARM
OR ACTION TAKEN BY RESET
DESCRIPTION PROBABLE CAUSE
ALERT CONTROL METHOD
NUMBER
T178 Loss of Communication with the Capacity Unit shutdown -HVAC Automatic Communication wiring problem with AUX1 or faulty
Control Board disable MBB, ECB, or AUXl
T179 Loss of communication with the Economizer No economizer Automatic Communication wiring problem with ECB or faulty
Control Board operation MBB, ECB, or AUXl
Loss of communication with the Economizer No economizer
T180 Actuator operation Automatic Communication wiring problem with actuator.
No Linkage Operation Received a table write from Linkage before, now not
A200 Linkage Timeout Error - Comm Failure fall back to local SPT Automatic receiving any linked commands
A404 Fire Shutdown Unit Shutdown Automatic Smoke detected by smoke detector
T408 Dirty Filter Alert Generated Automatic Dirty Filter
If IDF.F =
If IDF.F = Yes, then Unit YES, then
Fan Status Switch ON, Fan Contactor OFF Shutdown Manual, Bad Fan Status Switch. Configuration incorrect.
otherwise
T409 automatic
If IDF.F =
Fan Status Switch OFF, Fan Contactor ON If IDF.F = Yes, then Unit YES,Manual,then T ripped Circuit Breaker. Broken belt. Bad indoor fan
Shutdown otherwise motor. Configuration incorrect. Bad fan status switch.
automatic
Economizer Damper Actuator Out of Calibrate economizer (E.CAL). If problem still exist
Calibration Alert Generated Automatic then determine what is limiting economizer rotation.
Economizer Damper Actuator Torque Above
Load Limit Alert Generated Automatic Actuator load too high. Check damper load.
Economizer Damper Actuator Hunting Alert Generated Automatic Damper position changing too quickly.
T414 Excessively
No economizer motion. Check damper blades, gears,
Economizer Damper Stuck or Jammed Alert Generated Automatic
and actuator.
Economizer Damper Actuator Mechanical
Failure Alert Generated Automatic Check actuator and replace if necessary.
Economizer Damper Actuator Direction
Switch Wrong Alert Generated Automatic Actuator direction control switch (CCW, CW) wrong.
Bad sensor, bad wiring, or sensor configured
T415 IAQ Input Out of Range No IAQ Operations Automatic
incorrectly.
Bad sensor, bad wiring, or sensor configured
T416 OAQ Input Out of Range No OAQ Operations Automatic
incorrectly.
LEGEND
ECB - Economizer ControlBoard
IGC Integrated Gas Controller
MBB - Main Base Board
OAT - Outdoor-Air Thermistor
Cooling Troubleshooting
Use the Scrolling Marquee display or a CCN device to view the
cooling status display and the cooling diagnostic display (see
Appendix A) for information on the cooling operation. Check the
current alarms and alarm history for any cooling alarm codes and
correct any causes. (See Table 9.)
Verify any unique control configurations per installed site
requirements or accessories. If alarms conditions are corrected and
cleared, operation of the compressors and fans may be verified by
using the Service Test mode. (See Table 5.) See Table 9 for general
cooling service analysis.
30