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CHECKING THE OUTDOOR UNIT ELECTRICAL PARTS
MODEL RAM-50CNHZ2
[Air conditioner not operated/not operated correctly]
Is 220-240V supplied to L,N
terminal?
Is 25A fuse normal?
Is power circuit normal?
Refer to item of power circuit
for details.
Is the 5V supplied between
Pin 4 (test pin) and pin 5
(5V) of CN18?
Operate outdoor unit
according to instructions on
“How to operate outdoor unit
independently”.
How is self-diagnosis lamp
(LD301) lighting?
If fuse is blown, other parts may be
affected. Take care.
(Mainly, varistor 2, diode stack,
smoothing capacitor, and system
power module.)
Is switching power circuit OK?
Is 3A fuse normal?
Refer to lighting mode of self-
diagnosis lamps.
Replace defective components.
Check to see whether the
connected cord D cable correctly?
If reversed, correct the cable
connection.
Replace defective components.
If 3A fuse is blown, switching
transformer, could be
defective.
()
No
No
Yes
Yes
Yes
No
Yes
TROUBLE SHOOTING
No
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