Vermont Casting MSZ-D36NA User Manual
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2. Indoor unit failure mode table
NOTE
: Blinking patterns of this mode differ from the ones of Troubleshooting check table (9-4.).
Left lamp of OP-
ERATION INDICA-
TOR lamp
Abnormal point
(Failure mode)
Condition Correspondence
Not lighted
Normal
—
—
1-time fl ash every
0.5-second
0.5-second
Room temperature
thermistor
thermistor
The room temperature thermistor short or open
circuit is detected every 8 seconds during op-
eration.
circuit is detected every 8 seconds during op-
eration.
Refer to the characteristics of the room temperature
thermistor (9-7.).
thermistor (9-7.).
2-time fl ash
2.5-second OFF
2.5-second OFF
Indoor coil thermis-
tor
tor
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
is detected every 8 seconds during operation.
Refer to the characteristics of the main indoor coil
thermistor, the sub indoor coil thermistor (9-7.).
thermistor, the sub indoor coil thermistor (9-7.).
3-time fl ash
2.5-second OFF
2.5-second OFF
Serial signal
The serial signal from outdoor unit is not re-
ceived for a maximum of 6 minutes.
ceived for a maximum of 6 minutes.
Refer to 9-6. "How to check miswiring and serial
signal error".
signal error".
11-time fl ash
2.5-second OFF
2.5-second OFF
Indoor fan motor
The rotational frequency feedback signal is
not emit during the 12 seconds the indoor fan
operation.
not emit during the 12 seconds the indoor fan
operation.
Refer to 9-6. "Check of indoor fan motor".
12-time fl ash
2.5-second OFF
2.5-second OFF
Indoor control
system
system
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
memory of the indoor electronic control P.C.
board.
Replace the indoor electronic control P.C. board.