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The alarm codes for the IGC control board are shown in
Table 44.
Table 44 — IGC Control Board LED Alarms
Diagnostic 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. A constant
pulse is normal unit operation. A series of quick blinks indi-
cates an alarm. Refer to Table 45 below for a description of
alarms. The yellow LED blinks during transmission with the
CCN (Carrier Comfort Network). The green LED blinks dur-
ing transmission with the expansion board.
Table 45 — Control Board LED Alarms
LEGEND
INDICATION ERROR MODE
ON Normal Operation
OFF Hardware Failure
1 FLASH Fan ON/OFF Delay Modified
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
9 FLASHES Software Lockout
LED
BLINKS
ERROR
CODE
DESCRIPTION
RESET
METHOD
ACTION TAKEN
BY CONTROL
TROUBLESHOOTING COMMENTS
1 — Normal Operation — None The expansion board and control board flash the red LED
in one-second intervals when the board is operating properly.
2 HF-13 Compressor 1 Safety Automatic
and
Manual
Cooling disabled.
Automatic reset after
15 minutes. Manual if
repeated 3 times in
90 minutes.
The high or low pressure safety switch for compressor no. 1
has opened for 3 seconds. The error will be cleared and
compressor no. 1 will be allowed to turn on in 15 minutes.
If the safeties have been tripped 3 times in 90 minutes,
compressor no. 1 will be locked out until the control
board has been manually reset.
3 HF-14 Compressor 2 Safety Automatic
and
Manual
Cooling disabled.
Automatic reset after
15 minutes. Manual if
repeated 3 times in
90 minutes.
The high or low pressure safety switch for compressor no. 2
has opened for 3 seconds. The error will be cleared and
compressor no. 2 will be allowed to turn on in 15 minutes.
If the safeties have been tripped 3 times in 90 minutes,
compressor no. 2 will be locked out until the control
board has been manually reset.
4 HF-15 Thermostat Failure Automatic Alarm generated. The thermostat is calling for both heating and cooling
at the same time. The unit will operate on a first call basis
and will automatically reset.
5 HF-05 SAT Thermistor Failure Automatic Heating, cooling, and
economizer disabled.
The supply-air temperature (SAT) sensor has failed.
First check for wiring errors, then replace sensor.
6 HF-06 OAT Thermistor Failure Automatic NTFC, IAQ purge,
economizer, and low
ambient DX cooling
locked out disabled.
The outside air temperature (OAT) sensor has failed.
First check for wiring errors, then replace sensor.
7 HF-03 Space Temp. Sen. Failure Automatic Disables unoccupied
cooling/heating, CV
economizer, and CV
cooling/heating.
The space temperature sensor has failed.
First check for wiring errors, then replace sensor.
8 HF-12 RAT Thermistor Failure Automatic VAV heating
disabled.
The return-air temperature (RAT) sensor has failed.
Ensure that the unit is 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.
9 SE-05 Loss of Communications
with Expansion Board
Automatic Algorithms in
expansion board are
bypassed.
Communications between the expansion board and the
control board have been interrupted. Ensure that an
expansion board is installed and wired using the
wire harness supplied with the expansion module. If an
expansion board is not used ensure that DIP switch position
3 is in the closed position, and reset power.
10 HF-16 Control Board Failure None Control uses default
values. (May seem
as normal operation)
Generated when hardware has failed on control board.
Replace the control board.
Analog to Digital
Conversion
None All outputs turned off.
11 HF-17 Expansion Board Failure None All outputs turned off. Generated when hardware has failed on the
expansion board. Replace the expansion board.
12 SE-23 Cooling SAT Low
Limit Shutdown
Automatic Alarm generated. CV operation. When SAT low limits are below range and
compressor shut off.
DIP — Dual In-Line Package
VAV — Variable Air Volume