Carrier Understanding Furnace Code 24: Secondary Voltage Fuse is Open Troubleshooting
Page 19

Table 2ÐAir Conditioning (A/C) Airflow Setup Switch Position

AIR CONDITIONER

AIRFLOW

A/C SWITCH POSITION

 

ALLOWABLE FURNACE MODEL SETUP

 

 

(TONS)

(CFM)

A/C-1

A/C-2

A/C-3

040

060

080

 

080

 

100

 

120

Default

1200 or

OFF

OFF

OFF

3 Tons

3 Tons

3 Tons

5

Tons

5

Tons

5

Tons

2000

1200 CFM

1200 CFM

1200 CFM

2000 CFM

2000 CFM

2000 CFM

 

 

 

 

1-1/2

600

ON

OFF

OFF

X

X

X

 

Ð

 

Ð

Ð

 

2

800

OFF

ON

OFF

X

X

X

 

X

 

X

 

X

2-1/2

1000

ON

ON

OFF

X

X

X

 

X

 

X

 

X

3

1200

OFF

OFF

ON

X

X

X

 

X

 

X

 

X

3-1/2

1400

ON

OFF

ON

X

X

X

 

X

 

X

 

X

4

1600

OFF

ON

ON

Ð

Ð

Ð

X

 

X

 

X

 

5

2000

ON

ON

ON

Ð

Ð

Ð

X

 

X

 

X

 

XÐIndicates allowable selection.

Table 3ÐContinuous Fan (CF) Airflow Setup Switch Position

CONTINUOUS FAN

CF SWITCH POSITION

 

ALLOWABLE FURNACE MODEL SETUP

 

 

 

 

 

 

 

080

 

 

(CFM)

CF-1

CF-2

CF-3

040

060

080

100

120

(5 Ton)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

OFF

OFF

OFF

565*

515*

690*

690*

860*

1035*

600

ON

OFF

OFF

X

X

X

Ð

Ð

Ð

800

OFF

ON

OFF

X

X

X

X

X

X

1000

ON

ON

OFF

X

X

X

X

X

X

1200

OFF

OFF

ON

X

X

X

X

X

X

1400

ON

OFF

ON

X

X

X

X

X

X

1600

OFF

ON

ON

Ð

Ð

Ð

X

X

X

2000

ON

ON

ON

Ð

Ð

Ð

X

X

X

 

 

 

 

 

 

 

 

 

 

*Add 15% additional CFM when Bypass Humidifier switch SW-3 on control board is used. XÐIndicates allowable selection.

Table 4ÐTwo-Speed AC/HP Airflow Requirements (CFM)

OUTDOOR UNIT CAPACITY

036

048

060

A/C Setting

3 TonsÐ1200

4 TonsÐ1600

5 TonsÐ2000

CF Setting

800

1000

1000

 

 

 

 

Fault Code 24

SECONDARY VOLTAGE FUSE IS OPENÐIndicates fuse is open and there is a short in low-voltage wiring.

STEP

ACTION

YES

NO

GO TO

1.

Turn power off and remove blower access panel.

Ð

Ð

2

2.

Is secondary voltage fuse blown? Check continuity to make sure.

5

3

Ð

3.

Replace furnace control board.

Ð

Ð

4

4.

Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.

Ð

Ð

INDEX

5.

Disconnect all thermostat leads from furnace control board (including HUM terminal) and replace

Ð

Ð

6

secondary voltage fuse.

 

 

 

 

6.

Depress door switch. Use a piece of tape to hold switch closed.

Ð

Ð

7

7.

Does Fault Code 24 flash?

8

10

Ð

8.

You have a short circuit in limit switch circuit. This includes limit switch, flame rollout switch, and

Ð

Ð

9

auxiliary limit switch.

 

 

 

 

9.

Fix problem and replace secondary voltage fuse if necessary.

Ð

Ð

4

10.

Jumper R and W/W1 thermostat terminals on furnace control board.

Ð

Ð

11

11.

Does Fault Code 24 occur when W/W1 is energized?

12

16

Ð

12.

Disconnect jumper wire across R and W/W1 thermostat terminals and replace secondary voltage

Ð

Ð

13

fuse.

 

 

 

 

13.

Disconnect PL2 from furnace control board and jumper R and W/W1 thermostat terminals on fur-

Ð

Ð

14

nace control board.

 

 

 

 

14.

Does Fault Code 24 occur when W/W1 is energized?

3

15

Ð

15.

You have a short circuit in pressure switch circuit.

Ð

Ð

9

16.

Does Fault Code 24 occur when low-pressure switch is energized?

17

20

Ð

17.

Disconnect PL2 from furnace control board.

Ð

Ð

18

 

 

 

 

 

19

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Contents Troubleshooting Guide Start Here Section ExampleÐCooling Mode ÐVariable Speed Furnace Control ÐWith DE Connection Lowed by the lowest number fault code. Example 13, 13 Service Status Code Example → ÐService Label/Fault Code InstructionsStep Action YES GO to ÐAir Conditioning A/C Airflow Setup Switch Position LEDs 1, 2, 3, or 4 on Solid Solid means on continuously Step Action YES GO to Fault Code Motor MTR2 →44 Page Lowed by the lowest number fault code. Example 14, 14 Fault Code ÐTwo-Speed AC/HP Airflow Requirements CFM ÐContinuous Fan CF Airflow Setup Switch PositionPage · LOW Heat Page →18 →40 Utes 14ÐIGNITION Lockout Ber indicated in Index for Fault Code →26 Turn power off Is inducer blower wheel okay? 55 ¬ Rpmrpm highlow ¬ →20 Index for Fault Code Cleanup and START-UP Instructions Appendix a Board Layout and SchematicControl Center Schematic Diagram Wiring SchematicIsolation Circuits Pressure Check DiagramAppendix B Appendix CAppendix D Quick Motor Test Procedure→33 →59 Example AIR Delivery Curve Ð Appendix EAir Delivery CurveÐ120-20 Air Delivery CurvesAir Delivery Curve Ð Air Delivery CurveÐ100-20Closet Ð Downflow Application Static Pressure Reading Location DiagramsBasement Ð Upflow Application Upflow Total Static Pressure Reading LocationsAttic Ð Horizontal Application Duct Static Check Sheet Quick Reference Information Appendix FThermostat Staging Algorithm Appendix GVariable Speed Condensing Furnace Algorithm Service Training
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