Carrier 48EJ, EW, EK, EY024-048 installation instructions IGC Control Board LED Alarms

The alarm codes for the IGC control board are shown in Table 22.

Table 22 Ð IGC Control Board LED Alarms

INDICATION	ERROR MODE
ON	Normal Operation
OFF	Hardware Failure
1 FLASH	Fan ON/OFF Delay Modi®ed
2 FLASHES	Limit Switch Fault
3 FLASHES	Flame Sense Fault
4 FLASHES	4 Consecutive Limit Switch Faults
5 FLASHES	Ignition Lockout Fault
6 FLASHES	Induced Draft Motor Fault
7 FLASHES	Rollout Switch Fault
8 FLASHES	Internal Control Fault

Diagnostic LEDs Ð 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. A constant pulse is normal unit operation. A series of quick blinks 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 green LED blinks during transmission with the expansion board.

Table 23 Ð Control Board LED Alarms

LED Blinks	Error Code	Description	Troubleshooting Comments
1	Ð	Normal Operation	The expansion board and control board ¯ash the red LED in one-second
			intervals when the board is operating properly.
			The high or low pressure safety switch for compressor no. 1 has opened for
2			3 seconds. The error will be cleared and compressor no. 1 will be allowed
	HF-13	Compressor 1 Safety	to 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 been
			manually reset.
			The high or low pressure safety switch for compressor no. 2 has opened for
3			3 seconds. The error will be cleared and compressor no. 2 will be allowed
	HF-14	Compressor 2 Safety	to 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 been
			manually reset.
4	HF-15	Thermostat Failure	The thermostat is calling for both heating and cooling at the same time. The
			unit will operate on a ®rst call basis and will automatically reset.
5	HF-05	SAT Thermistor Failure	The supply-air temperature (SAT) sensor has failed. First check for wiring
			errors, then replace sensor.
6	HF-06	OAT Thermistor Failure	The outside air temperature (OAT) sensor has failed. First check for wiring
			errors, then replace sensor.
7	HF-03	Space Temp. Sen. Failure	The space temperature sensor has failed. First check for wiring errors, then
			replace sensor.
8			The return-air temperature (RAT) sensor has failed. Ensure that the unit is
	HF-12	RAT Thermistor Failure	a VAV unit. If NOT a VAV unit set DIP switch position 1 to the closed position
			and reset power. Then check for wiring errors. Finally, replace sensor.
			Communications between the expansion board and the control board have
9		Loss of Communications	been interrupted. Ensure that an expansion board is installed and wired us-
	SE-05		ing the wire harness supplied with the expansion module. If an expansion
		with Expansion Board
			board 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 control
			board.
11	HF-17	Expansion Board Failure	Generated when hardware has failed on the expansion board. Replace the
			expansion board.
DIP Ð Dual In-Line Package
VAV Ð Variable Air Volume

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