Carrier 48TF004-007 LED Error Code Service Analysis, Heating Service Analysis, Led Off

Page 44

TROUBLESHOOTING

Table 32 — LED Error Code Service Analysis

PROBLEM

CAUSE

REMEDY

Hardware failure.

Loss of power to control module (IGC).

Check 5 amp fuse on IGC, power to unit, 24-v circuit breaker,

(LED OFF)

 

and transformer. Units without a 24-v circuit breaker have an

 

 

internal overload in the 24-v transformer. If the overload trips,

 

 

allow 10 minutes for automatic reset.

Limit switch fault.

High temperature limit switch is open.

Check the operation of the indoor (evaporator) fan motor.

(LED 2 flashes)

 

Ensure that the supply-air temperature rise is in accordance

 

 

with the range on the unit nameplate.

Flame sense fault.

The IGC sensed flame that should not be

Reset unit. If problem persists, replace control board.

(LED 3 flashes)

present.

 

4 consecutive limit

Inadequate airflow to unit.

Check operation of indoor (evaporator) fan motor and that

switch trips.

 

supply-air temperature rise agrees with range on unit name-

(LED 4 flashes)

 

plate information.

Ignition lockout.

Unit unsuccessfully attempted ignition for

Check ignitor and flame sensor electrode spacing, gaps, etc.

(LED 5 flashes)

15 minutes.

Ensure that flame sense and ignition wires are properly termi-

 

 

nated. Verify that unit is obtaining proper amount of gas.

Induced-draft motor fault.

IGC does not sense that induced-draft motor is

Check for proper voltage. If motor is operating, check the

(LED 6 flashes)

operating.

speed sensor plug/IGC Terminal J2 connection. Proper con-

 

 

nection: PIN 1 — White, PIN 2 — Red, PIN 3 — Black.

Rollout switch fault.

Rollout switch has opened.

Rollout switch will automatically reset, but IGC will continue to

(LED 7 flashes)

 

lock out unit. Check gas valve operation. Ensure that induced

 

 

draft blower wheel is properly secured to motor shaft. Reset

 

 

unit at unit disconnect.

Internal control fault.

Microprocessor has sensed an error in the soft-

If error code is not cleared by resetting unit power, replace the

(LED 8 flashes)

ware or hardware.

IGC.

If the IGC must be replaced, be sure to ground yourself to dissi- pate any electrical charge that may be present before handling new control board. The IGC is sensitive to static electricity and may be damaged if the necessary precautions are not taken.

IMPORTANT: Refer to Table 19 — Heating Service Analysis for additional troubleshooting analysis.

LEGEND

IGC — Integrated Gas Unit Controller

LED — Light-Emitting Diode

Table 33 — Heating Service Analysis

PROBLEM

CAUSE

REMEDY

 

Burners will not ignite.

Misaligned spark electrodes.

Check flame ignition and sensor electrode positioning. Adjust as needed.

 

No gas at main burners.

Check gas line for air, purge as necessary. After purging gas line of air,

 

 

 

allow gas to dissipate for at least 5 minutes before attempting to relight

 

 

unit.

 

 

 

Check gas valve.

 

 

Water in gas line.

Drain water and install drip leg to trap water.

 

 

No power to furnace.

Check power supply, fuses, wiring, and circuit breaker.

 

 

No 24 v power supply to control circuit.

Check transformer. Transformers with internal overcurrent protection

 

 

require a cool down period before resetting.

 

 

Miswired or loose connections.

Check all wiring and wire nut connections.

 

 

Burned-out heat anticipator in thermostat.

Replace thermostat.

 

 

Broken thermostat wires.

Run continuity check. Replace wires, if necessary.

 

Inadequate heating.

Dirty air filter.

Clean or replace filter as necessary.

 

 

Gas input to unit too low.

Check gas pressure at manifold. Clock gas meter for input. If too low,

 

 

increase manifold pressure, or replace with correct orifices.

 

 

Unit undersized for application.

Replace with proper unit or add additional unit.

 

 

Restricted airflow.

Clean filter, replace filter, or remove any restrictions.

 

 

Blower speed too low.

Use high speed tap, increase fan speed, or install optional blower, as

 

 

suitable for individual units.

 

 

Limit switch cycles main burners.

Check rotation of blower, thermostat heat anticipator settings, and tem-

 

 

perature rise of unit. Adjust as needed.

 

 

Too much outdoor air.

Adjust minimum position.

 

 

 

Check economizer operation.

 

Poor flame characteristics.

Incomplete combustion (lack of combus-

Check all screws around flue outlets and burner compartment. Tighten

 

tion air) results in:

as necessary.

 

 

Aldehyde odors, CO, sooting flame, or

Cracked heat exchanger.

 

 

floating flame.

Overfired unit — reduce input, change orifices, or adjust gas line or man-

 

 

 

 

ifold pressure.

 

 

 

Check vent for restriction. Clean as necessary.

 

 

 

Check orifice to burner alignment.

 

Burners will not turn off.

Unit is locked into Heating mode for a one

Wait until mandatory one minute time period has elapsed or re-

 

minute minimum.

set power to unit.

 

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Contents Installation, Start-Up, Service Instructions Field Fabricate Ductwork Secure all Rig and Place Unit Inspect unit forRoof Curb Dimensions Install Flue Hood Flue hood is shipped Install Gas Piping Unit is equipped forPhysical Data 48TF004-007 Unit Size 48TFFurnace Section Base Unit Dimensions Make Electrical Connections Steel Pipe Nominal DiameterFeet Or largerTerminal Block AHAElectrical Data Supply SizeType FLA RLA LRAMake Outdoor-Air Adjustments and Install Outdoor-Air Hood Position SettingTypical Access Panel Locations Horizontal Discharge Block-Off Plate Wiring Connections for Outdoor-Air Thermostat Completed Hood Assembly EconoMi$er Wiring Wiring Diagram for Power Exhaust System Default Potentiometer Settin gs SettingsPotentiometer Default Setting CO2 SP PPM Chan geover Set PointsAdjust Evaporator-Fan Speed Ad Direct Drive Motor MountingMotor Data Fan Rpm at Motor Pulley SettingsAccessory/FIOP Static Pressure* in. wg 48TF004-007 48TF004 3 Tons Standard Motor Direct Drive 48TF004 3 Tons Alternate Motor Belt Drive48TF004 3 Tons HIGH-STATIC Motor Belt Drive 48TF005 4 Tons Standard Motor Direct Drive48TF005 4 Tons Alternate Motor Belt Drive 48TF006 5 Tons Standard Motor Direct Drive 48TF006 5 Tons Alternate Motor Belt Drive48TF006 5 Tons HIGH-STATIC Motor Belt Drive 48TF007 6 Tons Standard Motor Belt Drive 48TF007 6 Tons HIGH-STATIC Motor Belt Drive 109 149189 2291028 10641005 93848TF005 4 Tons Alternate Motor Belt Drive 48TF005 4 Tons HIGH-STATIC Motor Belt Drive 1600 770 420 826 483 1700 811 494 865 5671800 852 578 1900 894 5671221 1600 826 483 931 641 1020 788 1101 956 11781252 1700 865 567 966 725 1051 883 1133 1061 1205885 623 942 700 928 700 982 779971 787 1022 867 1015 891 1063 9981900 982 779 1084 932 1160 1006 1223 1114 2000 1022 867 1121 1014 1188 1097 1254 12162100 1063 998 1140 1064 1196 1272 1292 2200 1104 1081 1159 1106 1229 1258Heating Altitude CompensationBtuh Nominal Nominal InputPage Service Economizer Adjustment Refer to Optional Econo LubricationTON Unit Charging Chart Cooling Charging Chart, 48TF006 TON Unit 60 Hz Charging ChartLED Error Code Description LED Indication Error Code DescriptionOFF FlashesBurner Tray Details LED Error Code Service Analysis Heating Service AnalysisProblem Cause Remedy LED OFFCooling Service Analysis Durablade Economizer Troubleshooting IFCEconoMi$er Troubleshooting Typical Wiring Diagram and Component Arrangement SAT CAPSEN SW1Copyright 2000 Carrier Corporation Page Remove and Use in Job File Preliminary Information

48TF004-007 specifications

The Carrier 48TF004-007 is part of the brand's renowned rooftop unit series, designed to deliver efficient, reliable performance for commercial applications. Ideal for spaces such as offices, retail stores, and small manufacturing facilities, these units encapsulate advanced technology to enhance indoor air quality and optimize climate control.

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