Troubleshooting In Test Operation; A Check Code Is Displayed On The Remote Controller - Toshiba MMY-MAP0804HT8-E Service Manual

7-5. Troubleshooting in Test Operation

If there are phenomena such as the output of a check code or the remote controller is not accepted when powered-
on after wiring work or during address setup operation, the following causes are considered.

7-5-1. A Check Code Is Displayed on the Remote Controller

Check the code
displayed on the
indoor remote
controller
E04
E16
E23
E25
E26
L04
L05(*)
L06(*)
L08
* "L05": Displayed on the indoor unit set up with priority
"L06": Displayed on the indoor units except the one set up with priority
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Header
unit 7-
segment
display
– 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
L08 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).
E08 œ -XX
Duplication of indoor addresses (address number in
Alternate the subcode of the check code are duplicated).
blinking
There is no outdoor terminal resistance, or
there are two or more resistances.
(After address setup, when terminal
resistance setup is changed after powering-
E07
on)
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
E06 normal operation can be performed.
E16 œ -XX
Exceeded the number or capacity of connected
Alternate indoor units
blinking
Communication between outdoor units has stopped. Check the number of connected outdoor units.
E23
Duplication of outdoor addresses (only when an
E25
outdoor address was manually set up)
Number of connected outdoor units has decreased.
E26 œ -XX
• When installing an outdoor backup
• The power of a follower unit is not turned on.
Alternate
blinking
Duplication of outdoor line addresses
• Line address setup error (occurred after
L04
connection between U1/U2 and U3/U4
connectors)
L06 Duplication of indoor units with priority
There are two or more indoor units set up with
priority.
Address setup error
L08 • Only indoor addresses of all the connected indoor
units are undefined.
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Cause
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.
ON
No connection between multiple refrigerant lines:
1 2
SW30 bit 2 is on.
Connection between multiple refrigerant lines:
SW30
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 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.
139
Countermeasures