Toshiba MMY-MUP2401HT8P-A User Manual

8-4. Check Codes Displayed on Remote Controller and SMMS-u Outdoor Unit
(7-Segment Display on I/F Board) and Locations to Be Checked
For other types of outdoor units, refer to their own service manuals.
Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
• Check remote controller
inter-unit tie cable (A/B).
• Check for broken wire or
connector bad contact.
• Check indoor power
supply.
• Check for failure in indoor
P.C. board.
• Check remote controller
address settings
(when two remote
controllers are in use).
• Check remote controller
P.C. board.
Remote
controller
Indoor-remote
controller
communication
trouble
(detected at
remote
controller end)
Stop of
corresponding
unit
Communication between
indoor P.C. board and
remote controller is
disrupted.
E01 — —
• Check internal
transmission circuit of
remote controller.
--- Replace remote
controller
as necessary.
Remote
controller
Remote
controller
transmission
trouble
Stop of
corresponding
unit
Signal cannot be transmitted
from remote controller to
indoor unit.
E02 — —
• Check remote controller
and network adaptor
wiring.
Indoor
unit Indoor-remote
controller
communication
trouble
(detected at
indoor end)
Stop of
corresponding
unit
There is no communication
from remote controller
(including wireless) or
network adaptor.
E03 — —
• Check order in which
power was turned on for
indoor
and outdoor units.
• Check indoor address
setting.
• Check indoor-outdoor tie
cable.
• Check outdoor terminator
resistor setting (SW100,
Bit 2).
Indoor unit Indoor-outdoor
communication
circuit trouble
(detected at
indoor end)
Stop of
corresponding
unit
Indoor unit is not receiving
signal from outdoor unit.
E04 — —
• Check power supply to
indoor unit.
(Is power turned on?)
• Check connection of
indoor-outdoor
communication cable.
• Check connection of
communication connectors
on indoor P.C. board.
• Check connection of
communication connectors
on outdoor P.C. board.
• Check for failure in indoor
P.C.
board.
• Check for failure in outdoor
P.C. board (I/F).
I/FNo. of indoor
units from
which signal is
received
normally
Dropping out of
indoor unit
All stop Condition 1
All indoor unit initially
communicating normally
fails to return signal for
specified length of time.
Condition 2
Outdoor I / F board
SW103, Bit4 : OFF
(Factory default)
E04
E06
• Check power supply to
indoor unit.
(Is power turned on?)
• Check indoor-outdoor
power-on sequence.
• Check indoor address
setting
• Check wiring of Indoor-
outdoor communication
wires
• Check outdoor terminator
resistor setting (SW100,
Bit 2).
Indoor unit Indoor-outdoor
communication
circuit trouble
Only specified
indoor units stop
Condition 1
Indoor unit initially
communicating
normally fails to return
signal for specified
length of time.
——
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
- 180 -

Toshiba MMY-MUP2401HT8P-A Specifications

General

Brand	Toshiba
Model	MMY-MUP2401HT8P-A
Category	Air Conditioner
Language	English

Summary

SERVICE MANUAL

SAFETY CAUTION

REFRIGERANT (R410A)

1. WIRING DIAGRAMS

2. PARTS RATING

2-1. Outdoor Unit (50Hz model: MMY-MUP***1HT8(J)P)

Lists parts and ratings for 50Hz outdoor units.

2-5. Inverter Assembly

Details components within the inverter assembly.

2-6. Parts Layout in Outdoor Unit

Visual representation of parts placement in outdoor units.

2-7. Parts Layout in Inverter Assembly

Visual representation of parts within the inverter assembly.

2-8. Outdoor (Inverter) Print Circuit Board

Explains the layout of the outdoor inverter circuit board.

3. REFRIGERANT PIPING SCHEMATIC DRAWING

4. COMBINED REFRIGERANT PIPING SYSTEM SCHEMATIC DIAGRAMS

4-1. Refrigerant Flow (Cooling)

Illustrates the refrigerant flow during cooling operation.

4-2. Refrigerant Flow (Single Defrost)

Illustrates the refrigerant flow during single defrost operation.

4-3. Refrigerant Flow (Heating)

Illustrates the refrigerant flow during heating operation.

4-4. Refrigerant Flow (Individual Defrost)

Illustrates refrigerant flow for individual defrost operations.

4-5-1. (1) Refrigerant Flow (Automatic emergency cooling)

Shows refrigerant flow during automatic emergency cooling.

4-5-2. (1) Refrigerant Flow (Automatic emergency heating)

Shows refrigerant flow during automatic emergency heating.

4-6. Refrigerant Flow (Reclaim)

Illustrates refrigerant flow during the reclaim process.

5. CONTROL OUTLINE

5-1. Outdoor Unit

Details the control functions of the outdoor unit.

6. APPLIED CONTROL AND FUNCTIONS

6-1. Optional connector Specifications of Indoor P.C.Board

Lists specifications for optional indoor P.C. board connectors.

6-2. Test Operation of Indoor Unit

Describes how to perform test operations for indoor units.

6-3. Method to Set Indoor Unit Function DN Code

Explains how to set indoor unit function codes via remote controller.

6-4. Method to set Outdoor Unit Function Code No. (O.DN )

Guides setting outdoor unit function codes using switches or remote controller.

6-5. Applied Control of Indoor Unit

Details control systems using remote location ON/OFF boxes.

6-6. Applied Control of Outdoor Unit

Explains applied controls for outdoor units based on settings.

6-7. Notice Code

Explains how notice codes are displayed and managed.

6-8. System Cooperation Defrosting

Describes how systems cooperate to manage defrosting timing.

6-9. Night operation (Sound reduction control)

Details how to set night operation for reduced sound levels.

7. TEST OPERATION

7-1. Procedure and Summary of Test Operation

Provides an overview and steps for test operations.

7-2. Check Items before Test Operation (before powering-on)

Lists essential checks before starting test operations.

7-3. Check at Main Power-on

Steps to check the system after main power is turned on.

7-4. Address Setup

Procedures for setting system addresses.

7-5. Troubleshooting in Test Operation

Addresses issues encountered during test operations.

7-6. Test Operation Check

Procedures to check system operation after test run.

7-7. Service Support Function

Provides functions for service support and troubleshooting.

7-8. Wave Tool Advance for SMMS-u Series

Information on using the Wave Tool Advance application.

8. TROUBLESHOOTING

8-1. Overview

Provides an overview of troubleshooting procedures and tools.

8-2. Troubleshooting method

Explains how to use check codes for troubleshooting.

8-3. Troubleshooting based on information displayed on remote controller

Troubleshooting based on remote controller displays and history.

8-4. Check Codes Displayed on Remote Controller and SMMS-u Outdoor Unit (7-Segment Display on I/F Board) and Locations to Be Checked

Lists check codes and locations for troubleshooting.

8-5. Diagnosis procedure for each check code

Flowcharts for diagnosing specific check codes.

8-6. 7-Segment Display Function

Explains the function and usage of the 7-segment display.

8-7. Oil Level Judgment Display

How to check compressor oil levels using the display.

8-8. SMMS-u Outdoor Interface P.C. Board Function Setting Change Table

Table detailing DIP switch and function settings.

8-9. Leakage/Clogging of Refrigerating Cycle Circuit

Identifies check codes related to refrigerant or oil circuit issues.

9. BACKUP OPERATION (EMERGENCY OPERATION)

9-1. Note for Backup Operation

Important notes and considerations for backup operations.

9-2. Compressor Backup Operation Setting

Procedure for setting compressor backup operation.

9-3. Outdoor Unit Backup Operation Setting

Procedures for setting outdoor unit backup operation.

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

Specific backup operation settings for cooling season.

9-5. Outdoor Unit Automatic Backup Operation Outline

Overview of the automatic backup operation function.

10. OUTDOOR UNIT REFRIGERANT RECOVERY METHOD

10-1. Refrigerant Recovery from Troubled Outdoor Unit (Reclaim)

Methods for reclaiming refrigerant from faulty outdoor units.

10-2. How to Operate System While Troubled Outdoor Unit Being Repaired

Guides system operation while a unit is under repair.

10-3. Work procedure after Repair

Steps to follow after completing repairs, including vacuuming.

11. REPLACING COMPRESSORS

11-1. Compressor Replacement Procedure (Outline)

Outlines the general steps for compressor replacement.

11-2. Replacement of Compressors

Detailed steps for replacing compressors and adjusting oil.

11-3. Check Procedure to Search Cause of Compressor Oil Shortage

Diagnosing causes of compressor oil shortage.

12. OUTDOOR UNIT PARTS REPLACEMENT METHODS

13. P.C. BOARD REPLACEMENT PROCEDURES

13-1. Replacement of outdoor P.C. board & Inverter Parts

Lists service parts for outdoor PC boards and inverters.

14. EXPLODED DIAGRAM/PARTS LIST

14-1. Outdoor unit (8, 10, 12, 14HP)

Exploded diagram and parts list for 8-14HP outdoor units.

14-2. Outdoor unit (14A, 16, 18, 20HP)

Exploded diagram and parts list for 14A-20HP outdoor units.

14-3. Outdoor unit (22, 24HP)

Exploded diagram and parts list for 22-24HP outdoor units.