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Error display :
e40
Is the power
supply voltage
proper?
• Is the installation space for the indoor and outdoor
units proper?
• Is there a short circuit in the indoor or outdoor
units?
• During cooling: Is FMo operating?
Is the service valve fully open?
• During heating: Is FMI operating?
Is the service valve fully open?
Is the filter clogged?
• Is liquid flowing back to the compressor?
• Is the compressor making abnormal noises?
NO
YES YES YES YES
Check the power supply.
Is the service
valve fully open?
NO
Open it fully.
Is the high
pressure during operation
proper?
Does it return to
normal if the power
supply is reset
(2 of 3 times)?
NO
Check the refrigerant level
and refrigerant circuit.
Check the
compressor's insulation
resistance and winding
resistance.
NO
NOYES
YES
Replace the compressor.
Check the
power transistor module
(See page 160)
OK
NG
Replace the outdoor
unit control PCB.
Replace the outdoor
unit control PCB.
It may be malfunction due to transient noise. If
there is a noise source nearby, take measures to
eliminate it.
NO
YES
Is the 63H1 operating?
The outdoor unit control PCB
is faulty. (The 63H1 input circuit
is faulty.) Replace
1. During Cooling
• Is the outdoor unit fan motor running?
• Is there a short circuit in the outdoor unit?
• Is there enough space for inlet and outlet?
2. During Heating
• Is the indoor unit heat exchanger thermistor separated
from the sensing case?
• Is the filter clogged?
3. During Cooling and Heating
• Is the refrigerant overcharge?
• Is the service valve fully open?
While the 63H1 is operating
10
[63H1 operation] (Only case of 301~601 type)
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
52C
primary side L3 phase
open?
NO
YES
(1)
(2)
The outdoor unit control PCB
is faulty. Replace
Repair
Notes (1) Also check if there is voltage at the L3 phase on the 52C primary
side, but no voltage on the secondary side (coil wire disconnection
or faulty contacts).
(2) If there is voltage at the L3 phase on the 52C primary side and it is
not abnormal, the outdoor unit control PCB is faulty.
[Open phase at L3-phase of 52C primary side]
11
[Current cut] (Only case of 151~251 type)
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
1 time flash
Outdoor unit
Error display :
e42
● Display conditions
If the inverter’s output current ex-
ceeds the set value, the compres-
sor stops. After a 3-minute delay, it
restarts, but if this occurs 3 times
within 20 minutes.