Toshiba MMY-MAP0804 Series, Quick Reference

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Troubleshooting in Test Operation
If there are phenomena such as the output of a check code or the remote controller is not accepted when
poweredon after wiring work or during address setup operation, the following causes are considered.
A Check Code Is Displayed on the Remote Controller
Cause
When outdoor power is off
Address setup error
• Only line addresses of the connected indoor
units are undefined.
• The outdoor line address and the line addresses
of all the indoor units do not match.
• The indoor addresses are duplicated.
(Units except those displaying E04 are duplicated.)
• A header unit is not set up in group control
(except groups displaying E04).
Duplication of indoor addresses (address number
in the subcode of the check code are duplicated).
There is no outdoor terminal resistance,
or there are two or more resistances.
(After address setup, when terminal
resistance setup is changed after
poweringon)
Transmission circuit error at the interface side
(PC board failure)
After address setup, communication from all the
indoor units is interrupted under the condition that
a normal operation can be performed.
Exceeded the number or capacity of connected
indoor units
Communication between outdoor units has
stopped.
Duplication of outdoor addresses (only when an
outdoor address was manually set up)
Number of connected outdoor units has decreased.
• When installing an outdoor backup
• The power of a follower unit is not turned on.
Duplication of outdoor line addresses
• Line address setup error
(occurred after connection between U1/U2 and
U3/U4 connectors)
Duplication of indoor units with priority
There are two or more indoor units set up with
priority.
Address setup error
• Only indoor addresses of all the connected
indoor units are undefined.o0
Countermeasures
Check that the header outdoor unit power is on
Set up the address again.
Set up the address again.
Check SW30 bit 2 of the header unit.
No connection between multiple refrigerant lines:
SW30 bit 2 is on.
Connection between multiple refrigerant lines:
SW30 bit 2 of the connected header unit is turned
on only for one line.
Replace the interface PC board.
Check and correct disconnection of the indoor/
outdoor communication line (the communication
line between the header unit and the leading
indoor unit).
Check for the influence of communication noise.
Adjust the number or capacity of connected indoor
units.
Check the number of connected outdoor units.
Check that outdoor unit power is on.
Do not use manual setup for outdoor addresses.
Correction of the cause of error occurrence
• If it occurs when installing a backup, clear the
error after setup finishes.
• If the power of a follower unit is not turned on,
turn on the power.
Modify the line address setup of the header unit
between lines.
(Set up SW13 and SW14 on the interface PC
board.)
Set up priority only for one indoor unit.
Among indoor units indicating “L05,” set one unit
with priority.
Set up the addresses again.
Modify the setup.
∗
“L05”: Displayed on the indoor unit set up with priority
“L06”: Displayed on the indoor units except the one set up with priority
ON
SW30
1
2
Check the code
displayed on the
indoor remote
controller
E04
E16
E23
E25
E26
L04
L05 (
∗
)
L06 (
∗
)
L08
Header unit
7- segment
display
—
L08
E08
Ù
-XX
Alternate
blinking
E07
E06
E16
Ù
-XX
Alternate
blinking
E23
E25
E26
Ù
-XX
Alternate
blinking
L04
—
L06
L08
19