Troubleshooting - Toshiba MMD-VNK502HEXE-TR Installation Manual

Air to Air Heat Exchanger with DX Coil Unit
17

Troubleshooting

Confirmation and check
When an error occurred in the Air to Air Heat
Exchanger with DX Coil Unit, the check code and the
indoor unit No. appear on the display part of the remote
controller.
The check code is only displayed during the operation.
If the display disappears, operate the Air to Air Heat
Exchanger with DX Coil Unit according to the following
"Confirmation of error log" for confirmation.
Check code Unit No. of the Air to Air Heat Exchanger
with DX Coil Unit with a problem
Confirmation of error log
When an error occurred on the Air to Air Heat
Exchanger with DX Coil Unit, the error log can be
confirmed with the following procedure. (The error log
is stored in memory up to 4 errors.)
The log can be confirmed from both operating status
and stop status.
2
3
55-EN
Installation Manual
1
When and buttons are pushed
simultaneously for 4 seconds or more, the
following display appears.
If [Service check] is displayed, the mode
enters in the error log mode.
• [01: Order of error log] is displayed in CODE No.
window.
• [Check code] is displayed in CHECK window.
• [Air to Air Heat Exchanger with DX Coil Unit
address in which an error occurred] is displayed
in Unit No.
2
Every pushing of button used to set
temperature, the error log stored in memory
is displayed in order.
The numbers in CODE No. indicate CODE No.
[01] (latest) → [04] (oldest).
REQUIREMENT
Do not push button because all the error log of the
Air to Air Heat Exchanger with DX Coil Unit will be
deleted.
3
After confirmation, push button to return
to the usual display.
1
Air to Air Heat Exchanger with DX Coil Unit
How to check
To display an error code or to confirm the operation status, the remote controller (wired remote controller and
central remote controller) is equipped with an LCD display, and the interface circuit board of the outdoor unit is
equipped with a 7 segment display. A self-diagnosis function is activated to find out the details of a problem with
the unit.
Error code list
The table below shows the error codes. See the table for details of error codes.
• To confirm the code from the remote controller, see "Wired remote controller display" in the table.
• To confirm the code from the outdoor unit, see "7 segment display on the outdoor unit" in the table.
Check code
Wired
remote 7 segment display on the
controller outdoor unit
display
Auxiliary code
E01 — —
E02 — —
E03 — —
E04 — —
Number of indoor units for
E06 E06
normal reception
— E07 —
Duplicate indoor addresses Duplicate indoor addresses
E08 E08
E09 — —
E10 — —
01: Indoor / Outdoor unit
communication
E12 E12
02: Communications
between outdoor units
E15 E15 —
00: Over capacity
~
E16 E16 01 : Number of connected
units
E18 — —
00: No center unit
E19 E19
02: Multiple center units
01: Outdoor connections of
another line
E20 E20
02: Indoor connections of
another line
02: No header unit
E21 E21 00: Number of duplicate
header units
E22 E22 —
E23 E23 —
E25 E25 —
Number of outdoor units for
E26 E26
normal reception
E28 E28 Detected outdoor unit No.
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Installation Manual
Check code name
Indoor unit - remote controller communication error (Detected by
remote controller)
Remote control transmission error
Indoor unit - remote controller communication error (Detected by indoor
unit)
Indoor / Outdoor unit communication circuit error (Detected by indoor
unit)
Number of indoor units decreasing
Indoor / Outdoor unit communication circuit error (Detected by outdoor
unit)
Duplicate header remote controllers
Indoor MCU communication error
Automatic address start error
No indoor unit during automatic address
Number of connected units / Over capacity
Indoor header - follower communication error
Unusual number of center outdoor units
Connections of another line during automatic address
Unusual number of thermal header units
Number of thermal units decreasing
Transmission error between outdoor units Number of thermal units error
(Reception error)
Duplicate terminal outdoor address settings
Number of connected outdoor units decreasing
Terminal outdoor error
Judging
device
Remote
controller
Remote
controller
Indoor
Indoor
I/F
I/F
Indoor I/F
Remote
controller
Indoor
I/F
I/F
I/F
Indoor
I/F
I/F
I/F
I/F
I/F
I/F
EN
I/F
I/F
56-EN