Troubleshooting Method - Toshiba MMU-AP0072H2UL Service Manual
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Also See for MMU-AP0072H2UL:
- Engineering data book (213 pages) ,
- Service manual (176 pages) ,
- Manual (28 pages)
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8-2. Troubleshooting Method
The remote controllers (main remote controller and central control remote controller) and the interface P.C. board
of an outdoor unit are provided with an LCD display (remote controller) or a 7-segment display (outdoor interface
P.C. board) to display operational status. Using this self-diagnosis feature, the fault site/faulty part may be identified
in the event of a fault by following the method described below.
The list below summarizes check codes detected by various devices. Analyze the check code according to where it is displayed and work out
the nature of the fault in consultation with the list.
• When investigating a fault on the basis of a display provided on the indoor remote controller or TCC-LINK central control remote controller -
See the "TCC-LINK remote control or main remote controller display" section of the list.
• When investigating a fault on the basis of a display provided on an outdoor unit - See the "Outdoor 7-segment display" section of the list.
• When investigating a fault on the basis of a wireless remote controller-controlled indoor unit - See the "Light sensor indicator light block"
section of the list.
List of Check Codes (Indoor Unit)
(Error detected by indoor unit)
Check code
Outdoor 7-segment display
TCC-LINK central
control or main remote
controller display
E03
–
E04
–
E08
E08 Duplicated indoor address
E10
–
E18
–
F01
–
F02
–
F03
–
F10
–
F11
–
F29
–
L03
–
L07
–
L08
L08
L09
–
L20
–
L30
L30 Detected indoor unit No.
P01
–
P10
P10 Detected indoor unit No.
P12
–
P31
–
Display of receiving unit
Indicator light block
Operation Timer Ready
Sub-code
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting,
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
Typical fault site
Flash
Indoor-remote controller periodic
communication error
Indoor-outdoor periodic
communication error
Duplicated indoor address
Indoor inter-MCU communication
error
Error in periodic communication
between indoor header and
follower unit
Indoor heat exchanger
ALT
temperature sensor (TCJ) error
Indoor heat exchanger
ALT
temperature sensor (TC2) error
Indoor heat exchanger
ALT
temperature sensor (TC1) error
Ambient temperature sensor (TA)
ALT
error
Discharge temperature sensor
ALT
(TF) error
SIM P.C. board or other indoor error
Duplicated indoor group header
SIM
unit
Connection of group control cable
SIM
to stand-alone indoor unit
SIM Indoor group address not set
SIM Indoor capacity not set
SIM Duplicated central control address
Indoor external error input
SIM
(interlock)
ALT Indoor AC fan error
ALT Indoor overflow error
ALT Indoor DC fan error
ALT Other indoor unit error
78
: Flashing,
: Goes off
Description of error
Communication from remote controller or network
adaptor has been lost (so has central control
communication).
Signals are not being received from outdoor unit.
Indoor unit detects address identical to its own.
MCU communication between main controller and
motor microcontroller is faulty.
Periodic communication between indoor header
and follower units cannot be maintained.
Heat exchanger temperature sensor (TCJ) has
been open/short-circuited.
Heat exchanger temperature sensor (TC2) has
been open/short-circuited.
Heat exchanger temperature sensor (TC1) has
been open/short-circuited.
Ambient temperature sensor (TA) has been open/
short-circuited.
Discharge temperature sensor (TF) has been open/
short-circuited.
Indoor EEPROM is abnormal (some other error may
be detected).
There is more than one header unit in group.
There is at least one stand-alone indoor unit to
which group control cable is connected.
Address setting has not been performed for one or
more indoor units (also detected at outdoor unit
end).
Capacity setting has not been performed for indoor
unit.
There is duplication in central control address
setting.
Unit shutdown has been caused by external error
input (CN80).
Indoor AC fan error is detected (activation of fan
motor thermal relay).
Float switch has been activated.
Indoor DC fan error (e.g. overcurrent or lock-up) is
detected.
Follower unit cannot be operated due to header unit
alarm (E03/L03/L07/L08).
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Troubleshooting
