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1. Power does not come on (no operation)
CHECKING THE INDOOR UNIT ELECTRICAL PARTS
Is 35V DC being generated
between terminals C and D on
the terminal board?
Is 220-230V AC being generated
between terminals L and N on
the outdoor unit terminal board?
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 the indicating P.W.B.
connection cord and light
receiving unit.
Check the reset circuit, and
repair any defective section.
Replace the microcomputer and
oscillator.
Check according to the proper
method for checking the power
circuit.
Is 35V DC being generated
between terminals C and D on
the outdoor unit terminal board?
Are connection wires C and D
reversed?
Ave control voltages (12V, 5V)
being generated normally?
Do the air deflectors perform
inital operation when the power
breaker is furned on and off?
Replace the control P.W.B.
Is the microcomputer reset input
(pin
⑦
)"Hi"?
Is the microcomputer clock signal
(10MHz at pin
⑩, ⑪
)being
generated normally?
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Perform final operation check.