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HE KING THE INDOOR UNIT ELE TRI AL PARTS
[Model : RAF-25NH4, RAF-50NH4, RAD-25QH4, RAD-40QH4]
1. Power does not come on (no operation)
Is 35V DC being generated
between terminals C and D on
the terminal board?
Yes
Ave control voltages (12V, 5V)
being generated normally?
Yes
Do the air deflectors perform
inital operation when the power
breaker is turned on and off?
No
Is the microcomputer reset input
(pin
)"Hi"?
※1
Yes
Is the microcomputer clock signal
(10MHz at pin
)being
※2
generated normally?
Yes
Replace the main P.W.B.
No
Is 230V AC being generated
between terminals L and N on
the outdoor unit terminal board?
Is 35V DC being generated
between terminals C and D on
the outdoor unit terminal board?
Are connection wires C and D
reversed?
No
Yes
No
※1 RAF-25NH4, 50NH4: ⑦
RAD-25QH4, 40QH4: ⑩
No
※2 RAF-25NH4, 50NH4: ⑩, ⑪
RAD-25QH4, 40QH4: ⑧, ⑨
Perform final operation check.
No
Yes
Yes
No
Yes
No
296
Check the indoor/outdoor unit
connecting cord, and correct any
defective section (wrong
connection, incomplete insertion).
Correct the cable connection.
Check the outdoor unit power
circuit, and repair the defective
section.
Check according to the proper
method for checking the power
circuit.
Check the Indication P.W.B.
connection cord and light
receiving unit.
Check the reset circuit, and
repair any defective section.
Replace the microcomputer and
oscillator.
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