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Toshiba MMY-MAP1204HT8P - User Manual

Toshiba MMY-MAP1204HT8P
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SERVICE MANUAL
AIR-CONDITIONER (MULTI TYPE)
<SUPER MODULAR MULTI SYSTEM - i>
Outdoor Unit
Model name:
FILE NO. SVM-13024-2
MMY-MAP0804HT8(J)P
MMY-MAP1004HT8(J)P
MMY-MAP1204HT8(J)P
MMY-MAP1404HT8(J)P
MMY-MAP1604HT8(J)P
MMY-MAP0804HT8(J)P-E
MMY-MAP1004HT8(J)P-E
MMY-MAP1204HT8(J)P-E
MMY-MAP1404HT8(J)P-E
MMY-MAP1604HT8(J)P-E
MMY-MAP0804HT8(J)P-TR
MMY-MAP1004HT8(J)P-TR
MMY-MAP1204HT8(J)P-TR
MMY-MAP1404HT8(J)P-TR
MMY-MAP1604HT8(J)P-TR
<Heat Pump Model>
<4-way Cassette Type>
(MMU-AP***4HP-E) (Made in Thailand model) SVM-13-011
<2-way Cassette Type>
(MMU-AP
***
2WH) A10-007
<Concealed Duct Standard Type>
(MMD-AP
***
6BH-E) A12-005
<Slim Duct Type>
(MMD-AP0244SPH-E, AP0274SPH-E) A12-005
Fresh Air Intake Indoor Unit Type
(MMD-AP
****
HFE) A06-016
<Air to Air Heat Exchanger with DX Coil Unit Type>
(MMD-VN
*****
HEXE
*
) A10-022-2
High-wall Type
(MMK-AP
***
3H) (Made in Thailand model) SVM-09-059
Console Type
(MML-AP
****
NH-E) (Made in Thailand model) SVM-11-036
Other indoor units
(MM
*
-AP
*****
H
*
) A10-033
MMY-MAP0804HT7(J)P
MMY-MAP1004HT7(J)P
MMY-MAP1204HT7(J)P
MMY-MAP1404HT7(J)P
MMY-MAP1604HT7(J)P
MMY-MAP0804T8(J)P
MMY-MAP1004T8(J)P
MMY-MAP1204T8(J)P
MMY-MAP1404T8(J)P
MMY-MAP1604T8(J)P
MMY-MAP0804T8(J)P-T
MMY-MAP1004T8(J)P-T
MMY-MAP1204T8(J)P-T
MMY-MAP1404T8(J)P-T
MMY-MAP1604T8(J)P-T
MMY-MAP0804T8(J)P-SG
MMY-MAP1004T8(J)P-SG
MMY-MAP1204T8(J)P-SG
MMY-MAP1404T8(J)P-SG
MMY-MAP1604T8(J)P-SG
<Cooling Only Model>
MMY-MAP0804T8(J)P-ID
MMY-MAP1004T8(J)P-ID
MMY-MAP1204T8(J)P-ID
MMY-MAP1404T8(J)P-ID
MMY-MAP1604T8(J)P-ID
This service manual provides relevant explanations about new outdoor unit (SMMS-i).
Please refer to the following service manuals for each indoor units.

Table of Contents

Questions and Answers

  • J
    James LongAug 8, 2025
    What to do if the Toshiba Air Conditioner indoor remote controller is not accepted and a check code is displayed?
    • R
      robertvanceAug 8, 2025
      If the indoor remote controller isn't working and a check code appears on the interface PC board of the header unit, the issue might stem from unset addresses or incorrect power settings. Start by setting up the addresses for the line and indoor units. If you're using group control, make sure a group address is set up. Also, confirm that the indoor unit power is turned on, ensuring you power on the indoor units before the outdoor units. Finally, check that the indoor/outdoor communication line is correctly connected to the U1/U2 terminal of the header unit.
  • W
    William RuizAug 18, 2025
    What to do if my Toshiba MMY-MAP1204HT8P is not accepting operation from the indoor remote controller?
    • D
      Dennis TaylorAug 18, 2025
      If your Toshiba Air Conditioner indoor unit isn't responding to the remote controller and there's no check code on the header unit's interface PC board, the problem likely lies in the communication wiring or address settings. First, check the communication line between the indoor and outdoor units and modify the wiring if necessary. Next, ensure that both the line address and indoor address are correctly set for the unit that's not responding. If you are using indoor group control, make sure that the power of the header unit of the group is turned on. If the unit is under individual control, verify that the group address is set to “0”. Finally, confirm that the power is turned on for the unit and that the indoor remote controller is properly wired.
  • K
    Kent DavisAug 28, 2025
    Why does my Toshiba MMY-MAP1204HT8P Air Conditioner display a lower number of connected units after address setup?
    • G
      Gerald CruzAug 29, 2025
      If you're encountering a situation where a lower number of connected units is displayed after address setup, it might be due to miswiring or unconnected wires in the communication lines. * For outdoor units, check the communication lines between them. If you find any issues, correct the wiring, set up the addresses again, and then verify the number of connected outdoor units. * Similarly, inspect the communication lines between indoor units. Correct any miswiring, set up the addresses again, and check the number of connected indoor units. Also, verify the wiring of the indoor remote controller.

Summary

<SUPER MODULAR MULTI SYSTEM - i>

1 Wiring Diagrams

1-1. Outdoor Unit Wiring Diagrams

Provides wiring diagrams for outdoor units, covering models MMY-MAP0804*, MAP1004*, and MAP1204*.

1-2. Indoor Unit Wiring Diagrams

Details wiring diagrams for various indoor unit types including cassette, duct, ceiling, and wall units.

2 Parts Rating

2-1. Outdoor Unit Parts Rating (50 Hz Models)

Lists parts ratings for outdoor units with 50Hz specifications, including compressors and valves.

3 Refrigerant Piping Systematic Drawing

4 Combined Refrigerant Piping System Schematic Diagrams

5 Control Outline

6 Applied Control and Functions (including Circuit Configuration)

6-1. Indoor Unit Controls and Circuit Configuration

Details indoor unit control block diagrams, PCB layouts, connector specifications, test operations, and DN code settings.

6-7. Applied Control for Outdoor Unit

Covers applied controls for outdoor units, including fan static pressure and priority operation modes.

6-8. Outdoor Unit Control Functions

Details applied controls for outdoor units, including peak-cut, snowfall, night operation, and mode selection.

7 TEST OPERATION

7-1. Test Operation Procedures

Covers procedure, pre-checks, power-on checks, address setup, troubleshooting, and fan checks.

7-7. Service Support Functions

Various functions for service support, including refrigerant line checks, operation control, and error clearing.

8 TROUBLESHOOTING

8-1. Troubleshooting Overview and Methods

Covers troubleshooting overview, methods, and common faults with possible causes.

8-2. Check Codes and Diagnosis

Lists and analyzes check codes from remote controllers and outdoor units for fault identification and diagnosis.

8-5. Diagnosis Procedures for Specific Check Codes

Provides detailed diagnostic flowcharts for specific check codes encountered during operation.

8-8. Refrigerating Cycle Leakage;Clogging Troubleshooting

Details troubleshooting for leakage or clogging in the refrigerating cycle and oil circuit, listing check codes.

9 BACKUP OPERATION (EMERGENCY OPERATION)

9-1. Notes for Backup Operation

Provides important notes and examples regarding compressor and outdoor unit backup operations.

9-2. Compressor Backup Operation Setting

Details the procedure for setting up compressor backup operation in outdoor units with faulty compressors.

9-3. Outdoor Unit Backup Operation Setting

Explains how to set up outdoor unit backup operation when a fault occurs in one unit of a multi-unit system.

9-4. Cooling-Season Outdoor Unit Backup Operation Setting

Describes a specific backup operation setting for cooling-season use, disabling heating operation.

10 OUTDOOR UNIT REFRIGERANT RECOVERY METHOD

10-1. Refrigerant Recovery from Failed Outdoor Unit (Pump-Down)

Provides procedures for refrigerant recovery from a failed outdoor unit using pump-down operation.

10-2. Operating System with Failed Outdoor Unit During Repair

Explains how to adjust refrigerant amount for system operation while a failed outdoor unit is under repair.

10-3. Work Procedure After Repair

Details the work procedure after repair, including vacuuming and refrigerant charging steps.

11 REPLACING COMPRESSORS

11-1. Compressor Replacement Procedure (Outline)

Provides an outline for replacing compressors, including oil checks and handling precautions.

11-2. Replacement of Compressors

Details the procedure for replacing compressors, including oil adjustment for new units.

11-3. Check Procedure for Compressor Oil Shortage Cause

Guides on how to search for the cause of compressor oil shortage, involving sensor checks and valve operation.

12 OUTDOOR UNIT PARTS REPLACEMENT METHODS

13 P.C. BOARD EXCHANGE PROCEDURES

13-1. Replacement of Indoor P.C. Boards

Details the procedure for replacing indoor P.C. boards, including reading and writing EEPROM data.

13-2. Replacement of Outdoor P.C. Boards

Lists service P.C. boards for outdoor units and provides replacement procedures for interface, compressor, and fan IPDUs.

14 EXPLODED DIAGRAM;PARTS LIST

Toshiba MMY-MAP1204HT8P Specifications

General IconGeneral
BrandToshiba
ModelMMY-MAP1204HT8P
CategoryAir Conditioner
LanguageEnglish

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