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Failure mode detected by the outdoor unit
O ... Possible
× .... Not possible
Diagnostic functional operation
Check
code
Operational cause
TD sensor failure
Open or short circuit in the discharge
F04
temperature sensor.
TE sensor failure
Open or short circuit in the heat
F06
exchange temperature sensor.
TL sensor failure
Open or short circuit in the heat
F07
exchange temperature sensor.
TO sensor failure
F08
Open or short circuit in the outdoor
temperature sensor.
TS sensor failure
Open or short circuit in the suction
F12
temperature sensor.
TH sensor failure
Open or short circuit in the heat sink
F13
temperature sensor.
TE, TS sensors failure
TE, TS sensor connections are
F15
opposite.
PD sensor failure
Open or short circuit the high pressure
F24
sensor.
EEPROM failure
F31
Compressor breakdown
Although operation has started,
operation frequency decreases and
operation stops.
H01
Compressor lock
Over-current detection after compressor
H02
start-up.
Determination and action
Backup
Automatic
operation
reset
1. Check the resistance value and
connection of the discharge sensor
O
X
(TD).
1. Check the resistance value and
connection of the heat exchange
O
X
temperature sensor (TE).
1. Check the resistance value and
connection of the heat exchange
O
X
temperature sensor (TL).
1. Check the resistance value
and connection of the outdoor
O
X
temperature sensor (TO).
1. Check the resistance value
and connection of the suction
O
X
temperature sensor (TS).
O
X
1. Replace the outdoor control board.
1. Check for any wrong installation
of the heat exchange temperature
O
X
sensor (TE) and the suction
temperature sensor (TS).
1. Check the value of PD sensor by the
remote controller.
O
X
2. Check the connection of PD sensor.
1. Replace the outdoor control board.
PC board
<401, 601> MCC-1768
O
X
<801, 1101, 1401> MCC-1675
<801, 1101, 1401>MCC-1781
(3 phase)
1. Check the power supply voltage (3
phase) <801,1101,1401> : AC380-
415V ±10%
Other than the above :
AC220-240V ±10%
O
X
2. Over-loaded condition of the
refrigeration cycle.
3. Check that the service valve is fully
open.
1. Failure of compressor (lock)
– Replace the compressor.
O
X
2. Failure of compressor wiring (open
phase).
118
Number of
abnormalities
Detailed
for
item
confirmation
118
4
135
118
4
135
118
4
135
119
1
135
4
136
8
136
4
136
4
136
1
136
8
127
8
127
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