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6. MAINTENANCE
6.1 Electrical parts failure diagnosis method
(1) Precautions:
① Be sure to switch off the power before disassembling and checking the air conditioner.
Maintenance of the indoor unit should commence 1 minute after the power is switched
off.
With respect to maintenance of the outdoor unit, the major circuit (electrolytic capacitor),
which may be charged, should be fully discharged before the maintenance.
② When removing the circuit board, do not vigorously press the circuit board or the bonded
parts.
③ When unplugging the plug connector, do not drag the electric wire and be sure to hold the
plug frame.
(2) Matters to be confirmed before diagnosis:
① Have you asked the user about the details of the failure?
② Does the air conditioner run? Does the self-diagnosis have any indication?
③ Is the voltage of the power socket correct?
④ Is the connection between the indoor and outdoor units wrong?
⑤ Is the outdoor refrigerant disconnecting valve opened?
(3) Procedure of diagnosis (when the air conditioner can’t run at all). When the air conditioner
runs but malfunctions, follow the procedure described in (4).
Important The air conditioner does not run at all when all of the following are met.
① The RUN lamp does not light up;
② The flap does not open;
③ The motor of the indoor fan does not rotate;
④ The self-diagnosis does not have indication.
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