Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48EJ Installation And Service Instructions Manual

Also see for 48EJ: Installation, Start-Up and Service Instructions User manual

Contents

The alarm codes for the IGC control board are shown inTable 22.Table 22 — IGC Control Board LED AlarmsINDICATION ERROR MODEON Normal OperationOFF Hardware Failure1 FLASH Fan ON/OFF Delay Modified2 FLASHES Limit Switch Fault3 FLASHES Flame Sense Fault4 FLASHES 4 Consecutive Limit Switch Faults5 FLASHES Ignition Lockout Fault6 FLASHES Induced Draft Motor Fault7 FLASHES Rollout Switch Fault8 FLASHES Internal Control FaultDiagnostic LEDs — There are 3 LEDs (red, yellow,and green) on the lower right hand side of the control board.The red light is used to check unit operation and alarms. Aconstant pulse is normal unit operation. A series of quickblinks indicates an alarm. Refer to Table 23 below for a de-scription of alarms. The yellow LED blinks during transmis-sion with the CCN (Carrier Comfort Network). The greenLED blinks during transmission with the expansion board.Table 23 — Control Board LED AlarmsLED Blinks Error Code Description Troubleshooting Comments1 — Normal Operation The expansion board and control board flash the red LED in one-secondintervals when the board is operating properly.2 HF-13 Compressor 1 SafetyThe high or low pressure safety switch for compressor no. 1 has opened for3 seconds. The error will be cleared and compressor no. 1 will be allowedto turn on in 15 minutes. If the safeties have been tripped 3 times in 90 min-utes, compressor no. 1 will be locked out until the control board has beenmanually reset.3 HF-14 Compressor 2 SafetyThe high or low pressure safety switch for compressor no. 2 has opened for3 seconds. The error will be cleared and compressor no. 2 will be allowedto turn on in 15 minutes. If the safeties have been tripped 3 times in 90 min-utes, compressor no. 2 will be locked out until the control board has beenmanually reset.4 HF-15 Thermostat Failure The thermostat is calling for both heating and cooling at the same time. Theunit will operate on a first call basis and will automatically reset.5 HF-05 SAT Thermistor Failure The supply-air temperature (SAT) sensor has failed. First check for wiringerrors, then replace sensor.6 HF-06 OAT Thermistor Failure The outside air temperature (OAT) sensor has failed. First check for wiringerrors, then replace sensor.7 HF-03 Space Temp. Sen. Failure The space temperature sensor has failed. First check for wiring errors, thenreplace sensor.8 HF-12 RAT Thermistor FailureThe return-air temperature (RAT) sensor has failed. Ensure that the unit isa VAV unit. If NOT a VAV unit set DIP switch position 1 to the closed positionand reset power. Then check for wiring errors. Finally, replace sensor.9 SE-05 Loss of Communicationswith Expansion BoardCommunications between the expansion board and the control board havebeen interrupted. Ensure that an expansion board is installed and wired us-ing the wire harness supplied with the expansion module. If an expansionboard is not used ensure that DIP switch position 3 is in the closed position,and reset power.10 HF-16 Control Board Failure Generated when hardware has failed on control board. Replace the controlboard.11 HF-17 Expansion Board Failure Generated when hardware has failed on the expansion board. Replace theexpansion board.DIP — Dual In-Line PackageVAV — Variable Air Volume60