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When the operation selector on the grille assy is moved from the ON or TEST position to the OFF (Self-diagnostics)
position, the indicator lamps will flash (or remain ON) for 5 seconds and then turn OFF for 2 seconds (buzzer sounds
once) to indicate the presence of a sensor failure or the activation of a protective function. Self-diagnostics is completed
when the buzzer sounds 3 beeps. If there is no trouble, the lamps do not flash. Also note that the corresponding parts
listed below may not be present in some models.
* *
Other :
Timer lamp flashes (3-second intervals): I/D float switch activated.
NOTE :
If the operation lamp continues to flash (orange) even when the operation switch has been moved to
the OFF position, an indoor unit external ROM failure has occurred. (E14) After inspection or repair
is completed, be sure to move the operation switch (on the electrical box) to the DEMO position,
turn the power OFF and ON and erase the diagnostics contents.
Control 1
*
Initial self-
Short-circuit terminals 2 and 4 on
diagnostics
No change
Only operation lamp
Change: Operation lamp and Service
illuminates
lamp illuminate, and Timer lamp flashes
Change: Operation lamp and Service
lamp illuminate, and Timer lamp flashes
- Turn the power OFF before performing short circuiting work.
- During the self-diagnostics check, the check results are the first indication when the operation switch is moved to OFF
while the indicators are flashing after power ON →DEMO (5 seconds) →ON.
- Before performing the above checks, perform DEMO operation, and check that AC 220 V is output toterminals 1 and
2. If it is not output, there is a failure related to the indoor unit power.
Details of Self-Diagnostics
the indoor unit terminal plate
Control 2
Short-circuit terminals 2 and 3 on
the outdoor unit terminal plate
-
Change: Operation lamp and Service
lamp illuminate, and Timer lamp flashes
Change: only operation lamp illuminates
18
Probable location of malfunction
Indoor unit circuit board failure
Outdoor unit circuit board failure
Failure (open circuit, contact failure,
etc.) in the inter-unit cable
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