Troubleshooting In Test Operation; A Check Code Is Displayed On The Remote Controller - Toshiba Super MMU-AP0091H Service Manual

8-5. Troubleshooting in Test Operation

If the phenomena appear, such as a check code is output or the remote controller is not accepted in power-ON
after cabling work or in address setup operation, the following causes are considered.

8-5-1. A check Code is Displayed on the Remote Controller

Check code Center unit
displayed on 7-segment
remote controller display
E04 E19-00
L08
E08-XX
E07
E06
E16 E16-XX
E25 E25
E26 E26-XX
L04 L04
L05 (*) L06
L06
L08 L08
(∗) [L05]: Displayed on the indoor unit set up with priority
[L06]: Displayed on the indoor unit except one set up with priority
Cause
Outdoor power is formerly turned on.
There is none of outdoor terminal resistance, or
there are two or more resistances.
(After address setup)
After address was decided, all the
indoor units do not correctly response
after power-ON in outdoor unit.
Address setup error
• Only line addresses of the connected indoor units
are undefined.
• The outdoor line address and the line addresses in
all 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 a group.
(Except group displaying E04)
Duplication of indoor addresses.
(Address No in which sub-code of the check code
are duplicated)
There is none of outdoor terminal
resistance, or there are two or more
resistances.
(After address setup, when terminal
resistance setup is changed after
power-ON.)
Transmission circuit error at interface side
(P .C. board failure)
After address setup, communication from all the
indoor units interrupted under condition that a
normal operation can be performed.
Exceeded No of connected indoor units or
exceeded capacity.
Duplication of outdoor addresses.
(Only when outdoor address was manually set up)
No. of connected outdoor units decreased.
• When setting outdoor backup
• The power of follower unit is not turned on.
Duplication of outdoor line addresses
• Line address setup error, occurred after connec-
tion between U , U and U , U
1 2 3
Duplicated 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.
Turn on the power again.
(In order of Indoor → Outdoor)
Check SW30 bit 2 of the header unit.
No connection between multiple refrigerant lines:
SW30 bit 20N
Connection between multiple refrigerant lines:
SW30 bit 2 of the connected header unit is turned
on only in one line.
ON
1 2
Check and modifies disconnection of indoor/outdoor
communication line.(Communication line between
center unit and the leading indoor unit)
SW30
Check influence of communication noise.
Set up address again.
Set up address again.
Check SW30 bit 2 of the header unit.
ON
No connection between multiple refrigerant lines:
1 2
SW30 bit 20N
Connection between multiple refrigerant lines:
SW30 bit 2 of the connected header unit is turned
SW30
on only in one line.
Replace the interface P .C. board.
Check and correct disconnection of indoor/outdoor
communication line.(Communication line between
header unit and the leading indoor unit)
Check influence of communication noise.
Adjust No of connected indoor units or capacity.
Do not use a manual setup for outdoor address.
Correct of cause of error occurrence
• If it occurred when setting backup, clear the error
after setup finish.
• If the power of follower unit is not turned on, turn
on the power.
Modify line address setup of the header unit
between lines. (Set up SW 13 and 14 on the
interface P .C. board.)
connectors
4
Set up priority to only one indoor unit.
Set up address again.
104
Countermeasures