Troubleshooting In Test Operation; A Check Code Is Displayed On The Remote Controller - Toshiba MCY-MHP0305HT-C Service Manual

8-5. 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.

8-5-1. A check code is displayed on the remote controller

Check the code Outdoor
displayed on the unit 7-
indoor remote segment
controller display
–
L08
E08 -XX
Alternate
blinking
E04
E07
E06
E16 -XX
E16
Alternate
blinking
L04 L04
L05(*) L06
L06(*)
L08 L08
* "L05": Displayed on the indoor unit set up with priority
"L06": Displayed on the indoor units except the one set up with priority
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.)
Duplication of indoor addresses (address number in
the sub code of the check code are duplicated).
Indoor / Outdoor communication circuit error.
(Detected by outdoor side)
Transmission circuit error at the interface side (P.C.
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
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.
61
84
Countermeasures
Check that the outdoor unit power is on
Set up the address again.
Set up the address again.
Check SW30 bit 2 of the outdoor unit.
No connection between multiple refrigerant lines:
SW30 bit 2 is on.
Check the communication connector between
indoor and outdoor unit.
Replace the interface P.C. board.
Check and correct disconnection of the indoor /
outdoor communication line.
Check for the influence of communication noise.
Adjust the number or capacity of connected indoor
units.
Modify the line address setup of the outdoor unit
between lines. (Set up SW13 and SW14 on the
interface P.C. 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.