Toshiba MMW-UP0271LQ-E Service Manual page 71

Check code
[E06]
Sub-code: No. of indoor units which received signals normally
Is power of indoor unit
turned on?
Yes
Did a power failure
occur?
No
Is
communication line
between indoor and
outdoor connected
correctly?
Yes
Is connection
of CN40 connector on
indoor P.C. board
normal?
Yes
Is there noise, etc?
No
TU2C-LINK system?
No
Replace indoor P.C. board.
• If "E06" appears on check code display or 7-segment display when the number of HWM (Hot water module) units connected in the system has
been reduced (In case of HWM powering off, or removing or transporting the unit,) confirm whether all the indoor units including HWM are
powered. If all the indoor units are powered, confirm the number of HWM units recorded on the I/F P.C.board. If the number of HWM units currently
connected is lower than that of recorded HWM units, "E06" appears on the display. If the number of HWM units connected has been reduced, turn
off Bits 4 of SW09 or SW103 on I/F P.C.board once and clear the number of HWM units recorded. If "L23-2" appears on the display when the Bits 4
of SW09 or SW103 on I/F P.C.board is OFF, turn on Bits 4 of SW09 or SW103 again while all the indoor units including HWM are powered.
The indicators of "E06" and "L23-2" will be released.
Finally, confirm that the number of HWM units recorded on I/F P.C.board is equal to that of HWM units currently connected. To confirm the number
of HVM units recorded on the I/F P.C.board, refer to "8-6.7-Segment Display Function" in the service manual (A10-2003) of outdoor unit.
Note:
When turning on Bits 4 of SW09 or SW103, be sure to turn on the power of all the indoor units including HWM connected to pipe in the system.
Failure to do so cause the number of HVM units that will be recorded on I/F P.C.board to incorrectly be recorded, causing the heat exchanger in
HWM to freeze and resulting in its rupture.
Check code name
Decreased number of indoor units
No
Yes
No
No
Yes
Yes
resistance set to indoor unit?
(confirm with service
(NOTE)
1. When signal is not sent for a certain period from the indoor unit which has
used to send signals normally, [E06] is displayed.
2. Address of indoor unit with terminating resistance set in system can be
confirmed on service monitor of remote controller [B8]. [9999] is displayed in
a case where no terminating resistance is set to any of the indoor units. See
" Monitoring function of wired remote controller" for confirmation method.
1. Communication lines Uv (U1, U2) connection trouble
between indoor and outdoor
2. Communication connector's connection trouble on
indoor unit, trouble on P.C. board
3. Communication connector's connection trouble on
outdoor unit, trouble on I/F board
4. Power supply of indoor unit (Is power turned on?)
5. Communication trouble with indoor unit with
terminating resistance set (TU2C-LINK
communication system only)
Is terminating
No
monitor)
Yes
– 71 –
Cause
Turn on power of indoor unit.
Clear the check code.
Correct communication line.
Correct wiring or connector.
Check noise, etc, and eliminate
it if any.
Perform setup of communication system
after resetting communication system
(set communication system and indoor
terminating resistance again)