Carrier 50HCQA Installation Manual Page 45
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Table 15 – IGC Board LED Alarm Codes
LED
FLASH
CODE
DESCRIPTION
ACTION TAKEN BY
CONTROL
RESET METHOD PROBABLE CAUSE
On Normal Operation
— — —
Off Hardware Failure No gas heating.
—
Loss of power to the IGC. Check 5 amp fuse on IGC,
power to unit, 24V circuit breaker, transformer, and
wiring to the IGC.
1Flash Indoor Fan On/Off Delay
Modified
5 seconds subtracted from
On delay.
5 seconds added to Off
delay (3 min max).
Power reset. High temperature limit switch opens during heat
exchanger warm-up period before fan-on delay
expires.
High temperature limit switch opens within
10 minutes of heat call (W) Off.
See Limit Switch Fault.
2Flashes Limit Switch Fault Gas valve and igniter Off.
Indoor fan and inducer On.
Limit switch closed, or
heat call (W) Off.
High temperature limit switch is open. Check the
operation of the indoor (evaporator) fan motor.
Ensure that the supply-air temperature rise is within
the range on the unit nameplate. Check wiring and
limit switch operation.
3Flashes Flame Sense Fault Indoor fan and inducer On. Flame sense normal.
Power reset for L ED
reset.
TheIGCsensedaflamewhenthegasvalveshould
be closed. Check wiring, flame sensor, and gas valve
operation.
4Flashes Four Consecutive Limit
Switch Fault
No gas heating. Heat call (W) Off.
Power reset for L ED
reset.
4 consecutive limi t switch faults within a single call for
heat. See L im it Switch Fault.
5Flashes Ignition Fault No gas heating. Heat call (W) Off.
Power reset for L ED
reset.
Unit unsuc c essfully attempted ignitio n for 15 minutes .
Check igniter and flame sensor electrode spacing, gaps,
etc. Chec k flame sens e and ignite r wiring . Check gas
valve oper ation and gas supp ly.
6Flashes Induced Draft Motor
Fault
If heat off: no gas heating.
If heat on: gas valve Off
and inducer On.
Inducer sense normal, or
heat call (W) Off.
Inducer sense On when heat call Off, or inducer
sense Off when heat call On. Check wiring, voltage,
and operation of IGC motor. Check speed sensor
wiring to IGC.
7Flashes Rollout Switch Lockout Gas valve and igniter Off.
Indoor fan and inducer On.
Power reset. Rollout switch has opened. Check gas valve
operation. Check induced-draft blower wheel is
properly secured to motor shaft.
8Flashes Internal Control Lockout No gas heating. Power reset. IGC has sensed internal hardware or software error. If
fault is n ot cleared by resetting 24 v power, replace
the IGC.
9Flashes Temporary Software
Lockout
No gas heating. 1 hour auto reset, or
power reset.
Electrical interference is disrupting the IGC software.
LEGEND
IGC --- Integrated Gas Unit Control
LED --- L i g h t --- E m i t t i n g D i o d e
NOTES:
1. Thereisa3---secondpausebetweenalarmcodedisplays.
2. If more than one alarm code exists, al l applicable al arm codes will be
displayed in numerical sequence.
3. Alarm codes on the IGC will be lost if power to the unit is interrupted.
Table 16 – Electric Heat Service Analysis
PROBLEM CAUSE REMEDY
Heat Will Not Turn On.
Active alarm. Check active alarms using ComfortLink Scrolling Marquee.
Unit is NOT configured for heat. Check heating configurations using the ComfortLink
Scrolling Marquee
No power to unit. Check power supply , fuses, wiring, and circuit breakers.
Unit is in minimum heat off-time, or minimum cool-heat
changeover time.
Check using ComfortLink Scrolling Marquee.
Thermostat or occupancy schedule setpoint not
calling for heating.
Check using ComfortLink Scrolling Marquee.
Heat f orced off in Service Test mode. Check using ComfortLink Scrolling Marquee. Turn Service
Test m o de o f f.
No 24 vac at heater contactor.
Check transformer and circuit breaker.
Check auto-reset limit switches on heater .
Check manual-reset limit switch (LS) on indoor fan housing.
Open temperature limit switch on heater. Check minimum airflow. Check limit switch when it is cool,
replace if open.
Inadequate Heating.
Dirty air filters. Replace air filters.
Thermostat or occupancy schedule setpoint only
calling for W1.
Allow time for W2 to energize or adjust setpoints.
Heat undersized for load. Decrease load or increase size of heater .
Restricted airflow Remove restriction. Check SAT compared to the SAT
heating limits.
Too much outdoor air. Check economizer position and configuration. Adjust
minimum position.
Limit switch cycles heaters. Check rotation of blower and minimum airflow.
Bad heater elements. Power off unit and remove high voltage wires. Check
resistance of element, replace if open.
Heat Will Not Turn Off.
Unit is in minimum heat on-time. Check u sing ComfortLink Scrolling Marquee.
Thermostat or occupancy schedule setpoint still
calling for heating.
Check using ComfortLink Scrolling Marquee.
Heat forced on in Service Test mode. Check using ComfortLink Scrolling Marquee. Turn Service
Test m o de o f f.
Heater contactor failed. P ower off unit. Check contactor and replace if closed.
ComfortLINK v2.X
- 48/50HC 04---28 1
- Single Package Rooftop Units 1
- SAFETY CONSIDERATIONS 2
- BASIC CONTROL USAGE 3
- Accessory Navigator Display 4
- Operation 4
- CCN Tables and Display 4
- Force Hierarchy 5
- Generic Status Display Table 5
- START-UP 6
- Condenser Fans and Motors 7
- Return--Air Filters 7
- Outdoor--Air Inlet Screens 7
- Accessory Installation 7
- Orifice Change (48HC) 7
- Gas Heat (48HC) 8
- Economizer 9
- SERVICE TEST 12
- THIRD PARTY CONTROL 13
- CONTROLS OPERATION 14
- General Operation 15
- Occupancy Determination 16
- Cooling Mode Control 18
- Staging Control 18
- Compressor Control 19
- Outdoor Fan Control 19
- Heating Mode Control 19
- Heat Relay Control 20
- Economizer Position % 21
- Fan Speed % 21
- Free Cooling 22
- Thermostat Control 22
- Space Sensor Control 22
- Unoccupied Free Cooling 22
- Power Exhaust (CV units) 22
- Power Exhaust (SAVt units) 23
- IAQ (Analog Input) 23
- IAQ (Switch Input) 24
- Fan Enable (Switch Input) 24
- Dehumidification Demand 25
- Reheat Modes 25
- Temperature Compensated Start 29
- Carrier Comfort Network (CCN) 30
- Configuration 30
- Demand Limit 30
- TROUBLESHOOTING 31
- Complete Unit Stoppage 32
- Restart Procedure 32
- Alarms and Alerts 32
- MBB --- Main Base Board 37
- Green LED 39
- Yellow LED 39
- Cooling Troubleshooting 40
- Economizer Troubleshooting 42
- Heating Troubleshooting 43
- IDM – Induced-Draft Motor 44
- “AUTO” position 44
- Phase Loss Protection 46
- Thermistor Troubleshooting 46
- CIRCUIT “B” 49
- CIRCUIT “A” 49
- Transducer Troubleshooting 50
- Forcing Inputs and Outputs 50
- MAJOR SYSTEM COMPONENTS 53
- RED LED - STATUS GREEN LED 62
- LEN (LOCAL EQUIPMENT NETWORK) 62
- YELLOW LED 62
- CCN (CARRIER COMFORT NETWORK) 62
- INSTANCE JUMPER (SET TO 1) 62
- RED LED-STATUS 66
- 48/50HC 04--14 Units — 67
- 48/50HC 17--28 Units — 68
- Central Terminal Board (CTB) 68
- Scrolling Marquee Display 70
- Accessory Navigatort Display 70
- Interface 70
- Protective Devices 72
- Field-Installed Accessories 72
- MODE — RUN STATUS 75
- MODE — RUN STATUS (cont) 76
- MODE — SERVICE TEST 78
- MODE — TEMPERATURES 78
- MODE — PRESSURES 78
- MODE — INPUTS 79
- MODE — OUTPUTS 79
- MODE — SET POINTS 79
- MODE — CONFIGURATION 80
- MODE — TIME CLOCK 85
- CCN ONLY TABLES 85
- MODE — OPERATING MODES 86
- MODE — OPERATING MODES (cont) 87
- MODE — ALARMS 89
- VFD Diagnostics 95
- Table 32 — FAULT CODES (cont) 96
- Table 33 – ALARM CODES 97
- INDICATE UNIT SETTINGS BELOW 98
- MODE — CONFIGURATION (cont) 100
- ComfortLINK v2.X 100
- ELECTRICAL 103
- TEMPERATURES 103
- PRESSURES 103
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