Troubleshooting Method - Toshiba MMY-MAP0806HT8(J)P Service Manual

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 problem site/problem part may be
identified in the event of a problem 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 problem in consultation with the list.
• When investigating a problem 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 problem on the basis of a display provided on an outdoor unit - See the "Outdoor 7-segment display" section of the list.
• When investigating a problem 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)
(Check code detected by indoor unit)
Check code
TCC-LINK central
control or main
remote controller
display
E03
E04
E08
E10
E18
F 0 1
F 0 2
F 0 3
F 1 0
F 1 1
F17
F18
F 2 9
L 0 3
L 0 7
L 0 8
L 0 9
L 2 0
L30
P 0 1
P10
P 1 2
P 3 1
AMP Air Conditioning
Display of receiving unit
Outdoor 7-segment display Indicator light block
Operation Timer Ready
Sub-code
– –
– –
E08 D u i l p a c e t i d d n o o a r d d e r s s
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
– –
L 0 8 –
– –
– –
L30 Detected indoor unit No.
– –
P10 Detected indoor unit No.
– –
– –
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting, : Flashing,
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
Typical problem site
Flash
Communication from remote controller or network
Indoor-remote controller periodic
adaptor has been lost (so has central control
communication error
communication).
Indoor-outdoor periodic
Signals are not being received from outdoor unit.
communication error
D u i l p a c e t i d d n o o a r d d e r s s n I
Indoor inter-MCU communication MCU communication between main controller and
error motor microcontroller is faulty.
Error in periodic communication
Periodic communication between indoor header
between indoor header and
and follower units cannot be maintained.
follower unit
Indoor heat exchanger Heat exchanger temperature sensor (TCJ) has
A L T
temperature sensor (TCJ) error been open/short-circuited.
Indoor heat exchanger Heat exchanger temperature sensor (TC2) has
A L T
temperature sensor (TC2) error been open/short-circuited.
Indoor heat exchanger Heat exchanger temperature sensor (TC1) has
A L T
temperature sensor (TC1) error been open/short-circuited.
Room air temperature sensor Room air temperature sensor (TA) has been
A L T
(TA/TSA) error open/short-circuited.
Discharge air temperature Discharge air temperature sensor (TF) has been
A L T
sensor (TF/TFA) error open/short-circuited.
Outside air suction temperature Open/Short of outside air suction temperature
ALT
sensor (TOA) error sensor (TOA) was detected.
Indoor air suction temperature Discharge air temperature sensor (TF) has been
ALT
sen sor (TRA) error
open/short-circuited.
Open/Short of indoor air suction temperature
I S M P.C. board or other indoor error
sensor (TRA) was detected.
Duplicated indoor group header
I S M There is more than one header unit in group.
unit
Connection of group control cable There is at least one stand-alone indoor unit to
I S M
to stand-alone indoor unit which group control cable is connected.
Address setting has not been performed for one or
I S M Indoor group address not set more indoor units (also detected at outdoor unit
end).
Capacity setting has not been performed for indoor
I S M Indoor capacity not set
unit.
There is duplication in central control address
I S M Duplicated central control address
setting.
Indoor external error input Unit shutdown has been caused by external error
SIM
(interlock) input (CN80).
Indoor AC fan error is detected (activation of fan
A L T Indoor AC fan error
motor thermal relay).
ALT Indoor overflow error Float switch has been activated.
Indoor DC fan error (e.g. overcurrent or lock-up) is
A L T Indoor DC fan error
detected.
Follower unit cannot be operated due to header unit
A L T Other indoor unit error
alarm (E03/L03/L07/L08).
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: Goes off
Description of Check code
o d r o u i n d t t e c e s t a d d e r s s d i n e c i t l a o t s t i o w . n