Carrier MMY-MAP0724FT9UL User Manual (English)

Christopher RiosJul 30, 2025

What to do if a check code is displayed on the Carrier Air Conditioner remote controller?

C
Christine DavisJul 30, 2025
If a check code appears on your Carrier Air Conditioner's remote controller, it could be due to several reasons: * The outdoor power might be off, so verify that the header outdoor unit power is on. * There might be an address setup error. In this case, set up the address again. * There might be no outdoor terminal resistance, or more than one resistance. Check SW30 bit 2 of the header unit. * Communication between outdoor units might have stopped. Check the number of connected outdoor units and ensure that outdoor unit power is on. * The number or capacity of connected indoor units might have been exceeded. Adjust the number or capacity of connected indoor units.

Brand	Carrier
Model	MMY-MAP0724FT9UL
Category	Air Conditioner
Language	English

Brand

Carrier

Model

MMY-MAP0724FT9UL

Carrier MMY-MAP0724FT9UL User Manual

Table of Contents

Questions and Answers:

Carrier MMY-MAP0724FT9UL Specifications

Summary

Warning Indications on the Air Conditioner Unit

Precautions for Safety

2. WIRING DIAGRAM

4. REFRIGERANT PIPING SYSTEMATIC DRAWING

5. SYSTEM REFRIGERANT PIPING SCHEMATIC DIAGRAMS

5-1. All Cooling mode (Operation of cooling only) when outside temperature is high (Standard: 50°F or higher) / Defrost mode

5-2. All Cooling mode (Operation of cooling only) when outside temperature is low (Standard: 50°F or lower)

5-3. All Heating mode (Operation of heating only)

5-4. Mainly cooling mode (Operating cooling function mainly, collective operation of cooling and heating operation)

5-5. Mainly heating mode (Operating heating function mainly, collective operation of cooling and heating operation)

5-6. Emergency operation (All cooling operation at backup of the header unit)

5-7. Emergency operation (All heating operation at backup of the header unit)

5-8. Refrigerant recovery (during pump-down operation) of the troubled outdoor unit) (In case of trouble of follower unit)

8. TEST OPERATION

8-1. Procedure and Summary of Test Operation

8-2. Check Items before Test Operation (before poweringon)

8-3. Check at Main Power-on

8-4. Address Setup

8-5. Troubleshooting in Test Operation

8-6. Test Operation Check

8-7. Confirmation of Test Operation

9. TROUBLESHOOTING

9-2. Troubleshooting Method

9-3. Troubleshooting Based on Information Displayed on Remote Controller

9-4. Check Codes Displayed on Remote Controller and SMMS-i Outdoor Unit (7-Segment Display on I/F Board) and Locations to Be Checked

9-5. Diagnosis procedure for each check code

9-8. Leakage/Clogging of Refrigerating Cycle Circuit

10. BACKUP OPERATION (EMERGENCY OPERATION)

10-1. Note for Backup Operation

10-2. Compressor Backup Operation Setting

10-3. Backup Setup for Outdoor Unit

11. OUTDOOR UNIT REFRIGERANT RECOVERY METHOD

11-1. Refrigerant Recovery from Failed Outdoor Unit (Pump-Down)

11-2. How to Operate System While Failed Outdoor Unit Being Repaired

12. REPLACING COMPRESSORS

12-1. Compressor Replacement Procedure (Outline)

12-2. Replacement of Compressors

12-3. Check Procedure to Search Cause of Compressor Oil Shortage

14. P.C. BOARD EXCHANGE PROCEDURES

14-3. Interface board replacement procedure

14-4. Comp-IPDU P.C. Board (MCC-1595) replacement procedure

14-5. Comp-IPDU P.C. Board (MCC-1596) replacement procedure

14-6. Fan IPDU P.C. board (MCC-1610) replacement procedure

14-7. Noise Filter P.C. Board (MCC-1608 A, B) Replacement Procedure

14-8. Noise Filter P.C. Board (MCC-1625 A, B, C) Replacement Procedure

WARNINGS ON REFRIGERANT LEAKAGE

Check of Concentration Limit

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