2 . When one room is not cooled (other rooms are cooled)
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
Yes
S hort circuit of t he thermi
stor error
Open circuit of the thermis tor error
Open circuit of s eria l s
ignal line
S hort circuit of serial s
ignal line
Is the t imer lamp of the
indoor unit in the room
not cooled flas hing ?
Press the OPERATION
button to s ta rt opera ting
the air-conditioner.
(S et the cooling mode
Is the t imer lamp of the
indoor unit in the room
not cooled flas hing ?
Check that the power
betwe e n the termina l
board "N" and "1" of the
indoor unit is AC 230V .
R epair the wiring
bet w een the unit s.
R eplace the indoor
control PW B.
Replace the thermistor.
Check the failure
sympt om with the failure
diagnos is mode.
R eplace the outdoor control
PWB
or the expansion valve (UNI T A )
or the expansion valve (UNI T B)
or the expansion valve (UNI T C )
or the expansion valve (UNI T D)
Is the re s is ta nc e va lue of the
winding in the fan motor
?
Abnormal fan motor of
indoor unit
The fuse is blown.
R eplace the indoor fan moto
r.
Is the wiring between the
units connected by mistake
or broken ?
R epair t he wiring between
the units .
Replace the indoorcontrolPWB.
Is the res is ta nce va lue of the ther
-
mis tor for UN IT A (T H6), U NIT B
(T H7), UNIT C (T H 8) or UN IT D
(T H9)
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