3-48
Check
code
Detected
position
Check
code name
Cause
(Position)
Trouble detection
condition
Check item (Position)
99
Remote
controller
Indoor
remote
controller
communica
tion alarm
Indoor remote
controller
communicatio
n circuit
Serial between indoor main
P.C. board (MCC-1361)
and remote controller
interruption.
• Check inter-unit wire (ABC).
• Check disconnection and connector contact
error.
• Check remote controller error.
• Check failure of indoor main P.C. board
(MCC-1361).
• Check duplication of indoor unit No.1.
(When group operation is set up.)
9A
Indoor
Indoor
miswiring/
misconnecti
on
Miswiring or
misconnectio
n of indoor
unit
By change of detection
value of indoor unit temp.
sensor or pressure sensor
after operation has started.
¤
Judgment time : Approx.
15 minutes after
activation
• Cooling : When changed
value of TC1 is 5°C or
less.
• Heating : When changed
value of pressure sensor
is 0.5MPa or less.
• Check miswiring of indoor unit which alarm is
displayed.
• Check for blockage in pipe of indoor unit which
alarm is displayed.
• Check refrigerant shortage.
[NOTE]
When checking miswiring, follow the items
below. Otherwise, misjudgment may be caused.
1) Check miswiring after outdoor unit stops 20
minutes or more.
Microprocessor is locked so that miswiring
check function does not operate forcibly for 2
minutes and 30 seconds after power has been
turned on.
2) Check miswiring under the following
conditions.
In cooling
Room temp.
: 18 to 32°C
Outside temp.
: 15 to 43°C
In heating
Room temp.
: 18 to 32°C
Outside temp.
: -15 to 15°C
3) When group operation for other outdoor
system is performed, miswiring check
function cannot
be used.
9F
Indoor
Indoor PMV
blockage
Judgment of
refrigerant
circulation
volume
shortage
Status that refrigerant did
not flow in indoor unit was
detected.
• Compared with TA temp.,
TC1 and TC2 temp. are
continuously below 4°C
for 60 minutes.
• Check indoor PMV open valve opening status.
• Check characteristics of TC1, TC2, and TA
sensor resistant value.
• Check indoor pressure sensor error.
• Check indoor PMV connector and wiring.
• Check for breakage and blockage of pipe.
• Check operation status of outdoor
compressor.
(When outdoor fan operates and compressor
stops, error is judged at indoor side. In this
case, check outdoor side.)
A0
Interface TD1 sensor
alarm
Discharge
temp. sensor
(TD1)
Sensor resistance value is
infinity or zero (Open,
Short).
• Check connection of TD1 sensor connector.
• Check characteristics of TD1 sensor
resistance value.
• Check outdoor P.C. board (Interface) error.
A1
Interface TD2 sensor
alarm
Discharge
temp. sensor
(TD2)
Sensor resistance value is
infinity or zero (Open,
Short).
• Check connection of TD2 sensor connector.
• Check characteristics of TD2 sensor
resistance value.
• Check outdoor P.C. board (Interface) error.
A2
Interface TS1 sensor
alarm
Suction temp.
sensor (TS1)
Sensor resistance value is
infinity or zero (Open,
Short).
• Check connection of TS1 sensor connector.
• Check characteristics of TS1 sensor
resistance value.
• Check outdoor P.C. board (Interface) error.
