Igc Control Board Led Alarms; Diagnostic Leds; Control Board Led Alarms - Carrier 48AK Installation, Start-Up And Service Instructions Manual

The alarm codes for the IGC control board are shown in
Table 44.
Table 44 — IGC Control Board LED Alarms
INDICATION
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 ERROR
DESCRIPTION
BLINKS CODE
1 — Normal Operation
2 HF-13 Compressor 1 Safety
3 HF-14 Compressor 2 Safety
4 HF-15 Thermostat Failure
5 HF-05 SAT Thermistor Failure
6 HF-06 OAT Thermistor Failure
7 HF-03 Space Temp. Sen. Failure Automatic Disables unoccupied
8 HF-12 RAT Thermistor Failure
9 SE-05 Loss of Communications
with Expansion Board
10 HF-16 Control Board Failure
Analog to Digital
Conversion
11 HF-17 Expansion Board Failure
12 SE-23 Cooling SAT Low
Limit Shutdown
LEGEND
DIP — Dual In-Line Package
VAV — Variable Air Volume
ERROR MODE
Table 45 — Control Board LED Alarms
RESET ACTION TAKEN
METHOD BY CONTROL
—
Automatic Cooling disabled.
and Automatic reset after
Manual 15 minutes. Manual if
repeated 3 times in
90 minutes.
Automatic Cooling disabled.
and Automatic reset after
Manual 15 minutes. Manual if
repeated 3 times in
90 minutes.
Automatic Alarm generated.
Automatic Heating, cooling, and
economizer disabled.
Automatic NTFC, IAQ purge,
economizer, and low
ambient DX cooling
locked out disabled.
cooling/heating, CV
economizer, and CV
cooling/heating.
Automatic VAV heating
disabled.
Automatic Algorithms in
expansion board are
bypassed.
None Control uses default
values. (May seem
as normal operation)
None All outputs turned off.
None All outputs turned off. Generated when hardware has failed on the
Automatic Alarm generated.
Diagnostic LEDs —
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.
TROUBLESHOOTING COMMENTS
None The expansion board and control board flash 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 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.
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.
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.
The supply-air temperature (SAT) sensor has failed.
First check for wiring errors, then replace sensor.
The outside air temperature (OAT) sensor has failed.
First check for wiring errors, then replace sensor.
The space temperature sensor has failed.
First check for wiring errors, then replace sensor.
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.
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.
Generated when hardware has failed on control board.
Replace the control board.
expansion board. Replace the expansion board.
CV operation. When SAT low limits are below range and
compressor shut off.
114
There are 3 LEDs (red, yellow, and