Toshiba MMU-AP0121MH Manuale Di Servizio

31

When a fault occurs in the air conditioner, the check
code and the indoor unit No. will appear on the display
part of the remote controller.

The check code will only be displayed while the unit is
in operation.

If the display disappears, operate the air conditioner
according to the following “Confirmation of error
history” for confirmation.

When a fault occurs in the air conditioner, the error
history can be confirmed with the following procedure.
(The error history is stored in memory and can contain
up to 4 errors).

This history can be confirmed from either the operating
status or the stop status.

CODE No.

UNIT   No.

R.C.

No.

Check code

Indoor unit No. in which 
an error occurred

ON / OFF

FAN

TEMP.

SWING/FIX

TIME

MODE

VENT

UNIT

SET

CL

FILTER
RESET TEST

TIMER SET

When pushing the 

SET

 and 

TEST

 buttons simultaneously for 4 seconds

or more, the display similar to the one shown in the figure to the right
will appear.

If [Service Check] is displayed, the fault code will be stored in the
error history mode.

• 01 (Order of error history) is displayed in CODE No. window.

• Check Code is displayed in the CHECK window.

• The indoor unit address, where the fault has occurred will be

displayed in the UNIT No. window.

When pushing the 

TEMP.

 buttons, the error history stored within the memory will be displayed in

chronological order.

The numbers displayed within the CODE No. window can vary between 1 and 4. 1 being the most recent fault
and 4 being the oldest.

Do not push the 

CL

 button as this will erase all of the error history for that indoor unit.

After confirmation, push the 

TEST

 button. This will return the display back to its original mode.

CODE No.

UNIT   No.

R.C.

No.

On the remote controller (Main remote controller, Central control remote controller) and the interface P.C. board of
the outdoor unit, a check display LCD (Remote controller) or 7-segment display (on the outdoor interface P.C.
board) operation is provided. Therefore the operation status can be known. Using this self-diagnosis function, a fault
and the location of this fault within the air conditioning system can be located, as shown in the table below.

The following list shows each check code. Find the check contents from the list according to part to be checked.
• In case of a fault from the indoor remote controller: See “Main remote controller display” in the list.
• In case of a fault from the outdoor unit: See “Outdoor 7-segment display” in the list.
• In case of a fault from the indoor unit with a wireless remote controller:

See “Sensor block display of receiving unit” in the list.

IPDU : Intelligent Power Drive Unit

¡

  : Lighting,  

¤

 : Flashing,  

l

 : Goes off

ALT. : Flashing is alternately when there are two flashing LED.
SIM : Simultaneous flashing when there are two flashing LED.

Operation

Timer

Ready

Flash

E01

—

—

¤

l

l

Communication error between indoor and remote
controller (Detected at remote controller side)

Remote controller

E02

—

—

¤

l

l

Remote controller transmission error

Remote controller

E03

—

—

¤

l

l

Communication error between indoor and remote
controller (Detected at indoor side)

Indoor

E04

—

—

l

l

¤

Communication circuit error between indoor/outdoor
(Detected at indoor side)

Indoor

E06

E06

No. of indoor units in which sensor has
been normally received

l

l

¤

Decrease of No. of indoor units

I/F

—

E07

—

l

l

¤

Communication circuit error between indoor/outdoor
(Detected at outdoor side)

I/F

E08

E08 Duplicated indoor addresses

¤

l

l

Duplicated indoor addresses

Indoor / I/F

E09

—

—

¤

l

l

Duplicated main remote controllers

Remote controller

E10

—

—

¤

l

l

Communication error between indoor MCU

Indoor

E12

E12

01: Indoor/Outdoor communication

02: Communication between outdoor units

¤

l

l

Automatic address start error

I/F

E15

E15

—

l

l

¤

Indoor is nothing during automatic addressing

I/F

E16

E16

00: Capacity over

01 ~: No. of connected units

l

l

¤

Capacity over / No. of connected indoor units

I/F

E18

—

—

¤

l

l

Communication error between indoor units

Indoor

E19

E19

00: Header is nothing

02: Two or more header units

l

l

¤

Outdoor header units quantity error

I/F

E20

E20

01: Outdoor of other line connected

02: Indoor of other line connected

l

l

¤

Other line connected during automatic address

I/F

E23

E23

—

l

l

¤

Sending error in communication between outdoor units

I/F

E25

E25

—

l

l

¤

Duplicated follower outdoor addresses

I/F

E26

E26

No. of outdoor units which received signal
normally

l

l

¤

Decrease of No. of connected outdoor units

I/F

E28

E28 Detected outdoor unit number

l

l

¤

Follower outdoor unit error

I/F

E31

E31

01: IPDU1 error

02: IPDU2 error

03: IPDU1, 2 error

04: Fan IPDU error

05: IPDU + Fan IPDU error

06: IPDU2 + Fan IPDU error

07: All IPDU error

l

l

¤

IPDU communication error

I/F