Check code

Check code name

Cause of operation

 

 

 

[E20]

Unit connected to other line

When starting automatic indoor address, a

 

during automatic address

device in other line is connected.

 

 

 

Auxiliary code : 01: Connection of outdoor in other line 02: Connection of indoor unit in other line

Separate the wire between lines according to address setup method.

Check code

Check code name

 

Cause of operation

 

 

 

[E23]

Communication sending error

1. Inter-unit cable connection error between

 

between outdoor units

 

outdoor units

 

 

2.

Communication connector connection error

 

 

 

between outdoor units, I/F P.C. board error

 

 

3.

End terminal resistance setup error between

 

 

 

outdoor units

 

 

 

 

Check code

Check code name

Cause of operation

 

 

 

[E25]

Duplicated address setup of

Addresses are duplicated by manual setting of

 

terminal outdoor units

outdoor address

 

 

 

Never set up the outdoor address manually.

Check code

Check code name

Cause of operation

[E26]

Decrease of connected

1. Outdoor unit backup setup

 

outdoor units

2.

Outdoor power error

 

 

3.

Communication line connection error between

 

 

 

outdoor units

 

 

4.

Connector connection error for communication

 

 

5.

Outdoor I/F P.C. board error

Auxiliary code : No. of outdoor units which received signals normally

YES

Is there no miscabling or

disconnection on communication line

between outdoor units? (1)

NO

YES

NO

Correct communication line.

Is outdoor unit setting backup?

NO

NO

Is main power of follower unit turned on?

YES

Clear the error, and then start operation. (*1)

Turn on the main power supply.

69

Is connection of CN03 connector on outdoor I/F P.C. board normal?

YES

Correct cabling of cable connector.

Is communication line between

outdoor units connected normally?

YES

Is communication connector (CN03)

NO

 

Correct connection of communication line.

NO

 

 

 

 

 

 

Correct connector connection.

 

 

Is not main power of

outdoor unit turned off?

NO

Is the end terminal resistance

between outdoor units turned on?

(SW30 Bit 1)

YES

Turn on main power of outdoor unit.

NO

Turn the end terminal resistance to ON.

between follower outdoor units connected?

YES

Check I/F P.C. board.

(Communication connector: CN03)

(∗ 1) How to clear the error

Set SW01/SW02/SW03 on I/F P.C. board of header unit to 2/16/1, and push SW04 for 5 seconds or more. (7-segment display: [Er.] [CL])

YES

Did power failure occur?

NO

Is there no noise source, etc?

NO

Check outdoor I/F P.C. board.

Defect Replace

YES

Clear check code.

YES

Check and eliminate noise, etc

(∗ 1) In this model, only one outdoor unit is provided to one refrigerant line. Be sure to check there is no communication connection with outdoor unit in the other refrigerant line.

•In this model, only one outdoor unit is provided to one refrigerant line. Be sure to check there is no communication connection with outdoor unit in the other refrigerant line.

Check code

Check code name

Cause of operation

 

 

 

[E28]

Terminal outdoor unit error

Terminal unit error

 

 

 

Auxiliary code : Detected outdoor unit number

SAn error occurred on the terminal unit. Confirm the check code of the terminal unit using 7-segment display on the I/F P.C. board of the terminal unit and check it according to the diagnostic procedure for each check code.

<How to specify the terminal outdoor unit on which error occurred>

Under condition that [E28] is displayed on the 7-segment display of the header unit, when pushing SW04 for 1 second or more, the fan of the outdoor unit which stopped due to the error rotates. If pushing SW05 alone, fan running is released.

Page 68 Page 70
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Image 69
Toshiba MMU-AP0121MH, MMU-AP0181MH, MMU-AP0151MH, MMU-AP0091MH E20, E23, E25, E26, ∗ 1 How to clear the error, E28
Page 68 Page 70

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications

The Toshiba MMU-AP series, consisting of models MMU-AP0121MH, MMU-AP0151MH, MMU-AP0091MH, MMU-AP0071MH, and MMU-AP0181MH, represents a significant advancement in the realm of power management and energy efficiency for a variety of applications. These modules are designed to optimize performance while ensuring minimal energy consumption, making them suitable for both commercial and industrial uses.

One of the standout features of the MMU-AP series is its intelligent power management technology. This feature allows for adaptive energy distribution based on real-time demands. By leveraging precise control algorithms, the modules can adjust their output to match the specific requirements of connected devices, ultimately leading to reduced power loss and increased efficiency. This adaptability not only benefits end-users by lowering operational costs but also contributes to a greener environment by minimizing waste.

The versatility of the MMU-AP series is evident in its wide range of operational capabilities. These power modules are designed to work effectively in various voltage levels and load conditions. With input voltage ranges suitable for standard industrial environments, they can easily be integrated into existing systems, enhancing overall functionality without requiring extensive modifications.

Moreover, the compact design of the MMU-AP modules is another notable characteristic. Their size and light weight facilitate easier installation and integration into tight spaces, making them ideal for applications where real estate is a premium. This compact profile does not compromise performance, as these modules are engineered to deliver robust power output while maintaining thermal efficiency.

In terms of reliability, the MMU-AP series is built with high-grade components that withstand harsh operating conditions. With features such as over-voltage protection, short-circuit protection, and thermal shutdown capabilities, users can trust that their equipment would operate safely and efficiently, thereby extending the lifespan of both the power modules and the devices they serve.

Finally, Toshiba’s commitment to innovation ensures that the MMU-AP series incorporates cutting-edge technology. The series supports communication protocols that enable seamless integration with smart systems, paving the way for advanced monitoring and control functions. This levels up the user experience, providing insights into performance and diagnostics that are crucial for uptime and reliability in demanding environments.

In conclusion, the Toshiba MMU-AP series offers a blend of efficiency, adaptability, and advanced technology, making it a valuable asset for various industrial and commercial applications. Its intelligent design and robust features ensure that users can optimize energy use while maintaining high performance and reliability.
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