Is it possible to
reset normally by the power
supply reset?
Does the drain
pump restart automatically
1 minute later?
Turn WS7-1 to OFF. ON
Disconnect the wire
between indoor and outdoor
units
YES
YES
NO
Note (1) SW7-1: OFFON
Note (2) Does the remote controller displays “Internal check ON” [ ] even
after 3 minutes?
Reset power supply
(2)
(1)
NO
Malfunction by noise
Check peripheral
environment.
Defective indoor PCB
Replace.
Defective remote controller
Replace.
2. Error detection method
When normal communication
is interrupted for more than 2
minutes between the remote
controller and the indoor unit
(Detectable only with the
remote controller)
3
.
Condition of error displayed
Same as above
4. Presumable cause
• Defective communication
circuit between remote
controller-indoor unit
• Noise
Note:
If the indoor unit cannot communicate normally with the remote controller for 180 seconds, the indoor unit PCB starts to
reset automatically.
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