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2) Indoor unit fan does not work.
• Is cool air prevention control working during heating?
3) Outdoor unit fan does not work or its fan speed changes.
• Is high-temp. release operation control working during heating?
• Is low outside air temperature operation control working during cooling?
• Is defrosting operation going?
4) Operation ON/OFF by remote controller is disabled.
• Is forcible operation OFF mode set?
• Is any remote controller or external control working?
• Is auto address setting in progress?
(At the first power on or when indoor unit address is changed, operation control is disabled
for about 5 minutes after power on.)
Are all cables/wiring set in the initial state?
Are indoor unit and receiver unit connected correctly?
(2) Troubleshooting procedure
When an error occurs, check the unit in the following procedure.
Error
Check indication of lamps
Check faulty location and parts
→
→
(Note)
Other than the check items in the table, malfunction or wrong diagnosis of microcomputer due
to effect of power or external noise is considered. If there is any source of noise, shield the
signal lines.
(a) Outline of judgment
The following describes the primary judgment of locating faulty unit (indoor unit or outdoor unit).
(In the case of group control operation, the header unit also indicates errors of follower unit by lamp.)
Judging from lamp status of indoor unit
The indoor unit monitors the operating status of air conditioner. When the protection circuit is
activated, the indoor unit indicates the following self-diagnosis contents.
l
: OFF
¡
: ON : Blinking (0.5 seconds interval)
Lamp indication
Operation Timer Preparing
All OFF
Operation Timer Preparing
Blinking
Operation Timer Preparing
Blinking
Operation Timer Preparing
Alternate blinking
Check code
—
E01
E02
E03
E08
E09
E18
E04
P12
Possible causes
Power OFF
Poor connection/contact between receiver/indication unit and indoor unit control board
Reception error
Wired
Wrong connection or poor
Transmission error
remote controller
contact between wired
Communication error
remote controller and indoor unit
Duplication of indoor unit No.
Invalid setting
Duplication of remote controller header
Poor connection/contact between indoor units or indoor unit power OFF
(Communication error between header and follower indoor units or
between twin header and follower indoor units)
Wrong connection or poor contact between indoor unit and outdoor unit
(Communication error between indoor and outdoor units)
Failure of indoor unit DC fan
(Protection device of indoor unit is activated.)
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