Troubleshooting Method - Carrier MMY-MAP0724FT9UL Service Manual

9-2. 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
or main remote
Sub-code
— —
— —
E08
Duplicated indoor address
— —
— —
— —
— —
— —
— —
— —
L02 —
— —
— —
L08 —
— —
— —
L30 Detected indoor unit No.
— —
P10
Detected indoor unit No.
— —
— —
Display of receiving unit
TCC-LINK Indicator light block
central control
Operation Timer Ready
controller
display
E03
E04
E08
E10
E18
F01
F02
F03
F10
F29
L02
L03
L07
L08
L09
L20
L30
P01
P10
P12
P31
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
* Indicator light display of the receiving unit may be different from
those in the following table. (Wall type 3 series, etc.)
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
ALT
(TA) error
SIM P.C. board or other indoor error
Outdoor unit model unmatched
SIM
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
– 130 –
: 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.
Indoor EEPROM is abnormal (some other error may
be detected).
In case that outdoor unit model is different
(Not corresponded)
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).