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Installation Manual
Air to Air Heat Exchanger
14 Troubleshooting
„ Check codes and parts to be checked
Wired remote
controller
display
„ Confirmation and check
When an error occurred in the Air to Air Heat
Exchanger, the check code and the unit No. of Air to Air
Heat Exchanger 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 according to the following “Confirmation of
error history” for confirmation.
* Unit No. of Air to Air Heat Exchanger is 31-OO.
Installation Manual
Air to Air Heat Exchanger
E01
2
Every pushing of
button used to set
temperature, the error history stored in
memory is displayed in order.
The numbers in CODE No. indicate CODE No.
[01] (latest) → [04] (oldest).
REQUIREMENT
Main defective parts
No header remote
controller
Judging
device
Remote
controller
Remote controller
communication error
No signal can be received from the indoor unit.
Remote controller
transmission error
Remote
controller
System interconnecting wires, indoor P.C. board, remote
controller --- No signal can be sent to the indoor unit.
E03
Indoor unit-remote
controller regular
communication error
Indoor
Remote controller, network adapter, indoor P.C. board --- No
data is received from the remote controller or network adapter.
E08
Duplicated indoor
addresses
Indoor
Indoor address setting error --- The same address as the selfaddress was detected.
Duplicated header
remote controllers
Remote
controller
Remote controller address setting error --- Two remote
controllers are set as header in the double-remote controller
control.
E09
3
Check code
After confirmation, push
to the usual display.
Incorrect remote controller setting --- The header remote
controller has not been set (including two remote controllers).
E02
Do not push
button because all the error history of
the Air to Air Heat Exchanger will be deleted.
Unit No. of the Air to Air Heat
Exchanger with a problem
Parts to be checked / error description
(* The header indoor unit stops raising alarm and follower indoor
units continue to operate.)
button to return
E18
Header indoor unit-indoor Indoor
follower unit regular
communication error
Indoor P.C. board --- Regular communication is not possible
between header and follower indoor units or between twin
header (main) and follower (sub) units.
„ Confirmation of error history
F17
Air to Air Heat Exchanger Air to Air Heat
(TOA) error
Exchanger
Outdoor Air sensor (TOA), indoor P.C. board --- Open-circuit or
short-circuit of the heat exchanger sensor (TOA) was detected.
When an error occurred on the Air to Air Heat
Exchanger, the error history can be confirmed with the
following procedure. (The error history is stored in
memory up to 4 troubles.)
The error can be confirmed from both operating status
and stop status.
F18
Air to Air Heat Exchanger Air to Air Heat
(TRA) error
Exchanger
Return Air sensor (TRA), indoor P.C. board --- Open-circuit or
short-circuit of the heat exchanger sensor (TRA) was detected.
F29
Indoor unit, other P.C.
board error
Indoor P.C. board --- EEPROM error
L03
Duplicated header indoor Indoor
units
Indoor address setting error --- There are two or more header
units in the group.
L08
Indoor group address not Indoor
set
Indoor address setting error --- Indoor address group has not
been set.
2
L09
L20
P31
1
3
Indoor
Indoor power level not set Indoor
Indoor power level has not been set.
LAN communication error Indoor
Address setting, central control remote controller, network
adapter --- Duplication of address in central control
communication
Other indoor unit error
Another indoor unit in the group is raising an alarm.
Indoor
E03/L07/L03/L08 alarm check locations and error description
* “Indoor” in “Judging device” refers to the Air to Air Heat Exchanger or the air conditioner.
1
When pushing
and
buttons at the
same time for 4 seconds or more, the
following display appears.
If [Service check]
is displayed, the mode
enters in the trouble history mode.
• [01: Order of error history] is displayed in CODE
No. window.
• [Check code] is displayed in CHECK window.
• [Air to Air Heat Exchanger address in which an
error occurred] is displayed in Unit No.
* Unit No. of Air to Air Heat Exchanger is 31-OO.
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