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SiMT041311E
Troubleshooting
Service Diagnosis
126
2.2
Air conditioner does not run.
Supposed
Causes
Power supply is OFF.
Improper power supply voltage
Improper connection of wire
Incorrect combination of indoor unit and outdoor unit
Battery shortage of remote controller
Invalid address setting
Protection device works
(dirty air filter, refrigerant shortage, overfilling, mixed air, etc.)
Transmission error between indoor unit and outdoor unit
(Defective outdoor unit PCB)
Troubleshooting
YES
YES
YES
YES
Insert the power supply
plug into the outlet. Turn on
the breaker for the power
supply.
Wait till the power is
restored.
Connect the power supply
of proper voltage (check
the varistor and the fuse).
Ask the electric power
company.
Replace the fuse or the
thermal fuse.
The 3-minute standby
function is activated.
Operation restarts
3 minutes later.
Connect the wires properly.
Is the power supply
plug inserted into the
outlet or the breaker for
the power supply
breaker ON?
Caution
Do the other electric
appliances work?
NO
NO
NO
NO
YES
NO
NO
YES
YES
Does the fuse or the
thermal fuse blow?
NO
Within 3 minutes after
operation stopped?
NO
Is the wire
connection and the
wire size correct?
YES
Power failure?
Is the power supply
voltage appropriate?
Go to the next page.
(R19677)
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Is the
power supply voltage
fluctuation within ±10% from
the rated value?