Mitsubishi Heavy Industries FDCVA1002HESAR, Technical Manual, Page: 281 / 329

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278
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Is the power
supply voltage
proper?
• Is the installation space for the indoor and outdoor
units proper?
• Is there any short circuit of air flow 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 refrigerant going back to the compressor?
Is the superheat controlled properly
Are the low pressure sensor and suction pipe
temperature thermistor normal?
• Is the compressor making anomalous noises?
NO
YES YES YES OK
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 amount
and refrigerant circuit.
Check the
compressor's insulation
resistance and winding
resistance.
NG
NO YES
YES
Replace the compressor.
Check the
power transistor module
(See page 287)
OK
NG
Replace the outdoor
unit inverter PCB.
Replace the outdoor
unit inverter PCB.
It may be malfunction due to transient noise. If
there is a noise source nearby, take measures to
eliminate it.
Note (2) In models 802 and 1002,
replace the power transistor as well.
Note (1) 0.4 low moro at 25˚C.
Note (3) In models 802 and
1002, also replace
the power transistor.
(2)
(1)
(3)
11
[Current cut]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Error display : E42
Display conditions
If the inverter’s output current ex-
ceeds the set value, the compressor
stops. After a 3-minute delay, it
restarts, but if this occurs 4(3) times
within 30(20) minutes.
12
Error display :
E45
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
YES
NO
YES
NO
Correct it
Correct it
Replace the outdoor
unit control PCB.
Are the connector connections
between the outdoor unit control PCB
and the inverter PCB good?
YES
Are JSW10, 11 (SW1, 2) on the
inverter PCB all OFF?
Is the outdoor unit
fan motor faulty?
Is the resistor (15
Ω)
of diode
module disconnected?
NO
Replace the outdoor
unit inverter PCB.
Replace the outdoor
unit fan motor.
Replace the outdoor
unit inverter PCB.
Did it return to normal?
(1)
(2)
(2)
Note (1) Values in ( ) show for the case of the 802, 1002 models.
(2) Only case of 802,1002 models.
Note (1) Values in ( ) show for the case of the 151~251 models.
[Inverter communications are anomalous] [Only case of 302~1002 models]