– 103 –
MODEL RAI-50NH5
[No operation or abnormal operation]
Is AC220-240V being
supplied to terminal L and N?
Is the 25A fuse normal?
If the 25A fuse has blown, be aware
that other parts may also be
defective (mainly, varistor 2, diode
stack, smoothing capacitors, system
power module, etc.).
No
Yes
CHECKING THE OUTDOOR UNIT ELECTRICAL PARTS
Replace any defective parts.
Is the power circuit normal?
See the description on
power circuit for details.
Is 5V being generated
between Pin 4 (0V) and pin
3 (5V) at CN 18 (test pin)?
Operate the outdoor unit
according to the instruction
“How to operate the outdoor
unit independently
”.
How did the self-diagnosis
lamp (LD301) light?
Is the switching power circuit OK?
Has the 3A fuse blown?
See the self-diagnosis lamp
lighting mode.
Check to see whether the
connected C and D cable
correctly? If reversed, correct the
cable connection.
Replace any defective parts.
If the 3A fuse has blown, the
switching transformer (T1),
R906, etc. may also be
defective.
()
No
Yes
Yes
No
Yes
0274E Pg 97-118(RAI-50NH5) 19/10/05, 3:37 PM103
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