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Toshiba MMY-MAP1204T8-SG - User Manual

Toshiba MMY-MAP1204T8-SG
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AIR CONDITIONER (MULTI TYPE)
SERVICE MANUAL
FILE No. A10-005
This service manual provides relevant explanations about new outdoor unit (SMMS-i). Please refer to
the following service manuals for each indoor units.
Outdoor Unit
<SUPER MODULAR MULTI SYSTEM-i>
Model name:
<Heat Pump Model>
<Cooling Only Model>
4-way Air Discharge Cassette Type
(MMU-AP 2H)
A08-004
Compact 4-way Cassette (600 × 600) Type
(MMU-AP 1MH)
A06-002
1-way Air Discharge Cassette Type SH (2 series)
(MMU-AP 2SH)
A05-007
2-way Air Discharge Cassette Type (2 series)
(MMU-AP 2WH)
A10-007
Slim Duct Type
(MMD-AP 1SPH)
A05-007
Fresh Air Intake Indoor Unit Type
(MMD-AP 1HFE)
A06-016
High-wall Type (2 series)
(MMK-AP 2H)
A05-005
High-wall Type (3 series)
(MMK-AP 3H)
SVM-09059
Other indoor units SMMS (1 series) A03-009, A03-010
MMY-MAP0804HT8(Z)(ZG)-E
MMY-MAP1004HT8(Z)(ZG)-E
MMY-MAP1204HT8(Z)(ZG)-E
MMY-MAP1404HT8(Z)(ZG)-E
MMY-MAP1604HT8(Z)(ZG)-E
MMY-MAP0804HT8(Z)(ZG)-TR
MMY-MAP1004HT8(Z)(ZG)-TR
MMY-MAP1204HT8(Z)(ZG)-TR
MMY-MAP1404HT8(Z)(ZG)-TR
MMY-MAP1604HT8(Z)(ZG)-TR
MMY-MAP0804HT8(Z)(ZG)
MMY-MAP1004HT8(Z)(ZG)
MMY-MAP1204HT8(Z)(ZG)
MMY-MAP1404HT8(Z)(ZG)
MMY-MAP1604HT8(Z)(ZG)
MMY-MAP0804HT7(Z)(ZG)
MMY-MAP1004HT7(Z)(ZG)
MMY-MAP1204HT7(Z)(ZG)
MMY-MAP1404HT7(Z)(ZG)
MMY-MAP1604HT7(Z)(ZG)
MMY-MAP0804T8(Z)(ZG)-E
MMY-MAP1004T8(Z)(ZG)-E
MMY-MAP1204T8(Z)(ZG)-E
MMY-MAP1404T8(Z)(ZG)-E
MMY-MAP1604T8(Z)(ZG)-E
MMY-MAP0804T8(Z)(ZG)
MMY-MAP1004T8(Z)(ZG)
MMY-MAP1204T8(Z)(ZG)
MMY-MAP1404T8(Z)(ZG)
MMY-MAP1604T8(Z)(ZG)
MMY-MAP0804T8-SG
MMY-MAP1004T8-SG
MMY-MAP1204T8-SG
MMY-MAP1404T8-SG
MMY-MAP1604T8-SG

Table of Contents

Questions and Answers

  • M
    Michael CampbellNov 7, 2025
    What to do if my Toshiba Air Conditioner isn't responding to the remote but there's no check code?
    • T
      Travis Jones DVMNov 7, 2025
      If your Toshiba Air Conditioner unit isn't responding to the indoor remote controller, but there's no check code on the header unit's interface PC board, consider these possibilities: * The communication line between the indoor and outdoor units might not be connected. Modify the wiring. * The line address and indoor address may not be set. Set up the address. * If in indoor group control, the power of the header unit of the group might not be turned on. Turn on the power. * A group address might be set to the follower unit for individual control. Set the group address to “0” in the case of individual control. * The power might not be turned on. Turn on the power. * The indoor remote controller might not be connected with a wire. Modify the wiring. * There might be miswiring...
  • E
    erobinsonNov 16, 2025
    Why does my Toshiba Air Conditioner show fewer connected units than expected after address setup?
    • S
      Shawna RogersNov 16, 2025
      If, after setting up the addresses on your Toshiba Air Conditioner, the number of connected outdoor or indoor units displayed is lower than expected, it could be due to: * Miswiring or an unconnected wire in the communication lines between outdoor units. After modifying the wiring, set up the addresses again and check the number of connected outdoor units. * Miswiring or an unconnected wire in the communication lines between indoor units. After modifying the wiring, set up the addresses again and check the number of connected indoor units. * The indoor remote controller is not connected with wire or there is miswiring of the indoor remote controller. Use the main indoor remote controller connected to a group, start a test operation, specify the unit that is not operating (the unit n...
  • E
    Ebony WashingtonNov 27, 2025
    Why does my Toshiba MMY-MAP1204T8-SG Air Conditioner remote controller display a check code?
    • P
      Patricia ForbesNov 27, 2025
      If a check code is displayed on your Toshiba Air Conditioner's remote controller, it could be due to several reasons: * The outdoor power might be off, so ensure the header outdoor unit power is on. * There might be an address setup error. In this case, set up the address again. * There could be no outdoor terminal resistance, or there might be two or more resistances. Check SW30 bit 2 of the header unit. If there is no connection between multiple refrigerant lines, SW30 bit 2 is on. If there is a connection between multiple refrigerant lines, SW30 bit 2 of the connected header unit is turned on only for one line. * It's possible there's a transmission circuit error at the interface side, which would require replacing the interface PC board. * Communication from all the indoor u...

Summary

SERVICE MANUAL

Outdoor Unit

General overview and introduction to the outdoor unit section, covering its role in the SMMS-i system.

1 Wiring Diagrams

Indoor Unit Wiring Diagrams

Detailed electrical schematics for various indoor unit types, crucial for installation and repair.

2 Parts Rating

Outdoor Unit Parts Rating

Lists components and specifications for different outdoor unit models, essential for maintenance and replacement.

Indoor Unit Parts Rating

Lists components and specifications for various indoor unit types, essential for maintenance.

4 Combined Refrigerant Piping System Schematic Diagrams

Normal Operation (COOL Mode; DEFROST Mode) - High Outside Air Temperature

Illustrates refrigerant flow during normal cooling operations under specific high outdoor temperature conditions.

5 Control Outline

6 Applied Control and Functions (including Circuit Configuration)

Explains system logic, control functions, and circuit configurations for both indoor and outdoor units.

7 TEST OPERATION

Procedure and Summary of Test Operation

Outlines the steps for performing a test operation and summarizing the expected results.

Address Setup

Crucial configuration step for system operation and communication between units.

8 TROUBLESHOOTING

Troubleshooting Method

Guides on diagnosing and resolving system faults using various methods and check codes.

9 BACKUP OPERATION (EMERGENCY OPERATION)

Outdoor Unit Backup Operation Setting

Procedure for operating the system in case of outdoor unit failure to maintain basic functionality.

10 OUTDOOR UNIT REFRIGERANT RECOVERY METHOD

Refrigerant Recovery from Failed Outdoor Unit (Pump-Down)

Essential maintenance procedure for safely recovering refrigerant from a faulty outdoor unit.

11 REPLACING COMPRESSORS

Compressor Replacement Procedure (Outline)

Core maintenance task for compressor replacement, including oil adjustment.

12 OUTDOOR UNIT PARTS REPLACEMENT METHODS

Outdoor Unit Parts Replacement

Covers replacement procedures for major external parts of the outdoor unit, including cabinet and fan motor.

13 P.C. BOARD EXCHANGE PROCEDURES

Replacement of Indoor P.C. Boards

Detailed steps for replacing the main control board of indoor units, including EEPROM data handling.

Replacement of Outdoor P.C. Boards

Detailed steps for replacing various P.C. boards within the outdoor unit, such as interface, IPDU, and noise filter.

14 EXPLODED DIAGRAM;PARTS PRICE LIST

SMMS-i OUTDOOR UNIT MMY-MAP0804 HT8(Z)(ZG)-E, MMY-MAP1004 HT8(Z)(ZG)-E, MMY-MAP1204 HT8(Z)(ZG)-E

Visual guide identifying outdoor unit parts for specific models, essential for ordering and replacement.

Toshiba MMY-MAP1204T8-SG Specifications

General IconGeneral
BrandToshiba
ModelMMY-MAP1204T8-SG
CategoryAir Conditioner
LanguageEnglish

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