Mitsubishi Electric LGH-F300RVX-E Handbook page 31

Error LED1 LED2
Symptom
code (Green) (Red)
4116 7 ( Only for LGH-
blinks F1200RVX-E)
Abnormal
rotation of the
exhaust fan
motor in the
upper unit
(Centrifugal
fan does not
work, insuf-
ficient motor
speed, ex-
cessive motor
speed, or
rotation de-
tected when
operation is
stopped)
5101 4 Outdoor air
blinks (OA) therm-
istor related
error
Cause
Faulty connection of the exhaust fan
motor connector (CN9) on the power
circuit board (upper)
Faulty connection of the connectors
(CN18 - CN118, CN19 - CN119, and
CN21 - CN121) between the control
circuit board and power circuit board
Faulty connection of the reactor con-
nectors (TB3 and TB4) on the power
circuit board (upper)
The model selection switch (SW6) is
not set correctly.
The temperature around the product
is high.
The motor and centrifugal fan are not
fixed securely.
Deformed centrifugal fan
Foreign objects around the centrifu-
gal fan
Fan motor failure
Circuit board failure
Faulty connection of the thermistor
connector (CN22) on the control
circuit board
Thermistor failure
─ 31 ─
Corrective action
Check the connector (CN9) con-
nection on the power circuit board
(upper).
Check the connectors connections
(CN18 - CN118, CN19 - CN119,
and CN21 - CN121).
Check the connector (TB3 and TB4)
connections on the power circuit
board (upper).
Make the SW6 setting appropriate
for the model.
(See chapter 8. (8) Setting status
record (page 48).)
Use the product at a temperature of
104°F (40°C) or lower.
Check the installation state of the
motor and centrifugal fan, and fix
them securely.
Replace the centrifugal fan.
Check the air course and around
the centrifugal fan, and remove any
foreign matter.
Check the resistance between the
motor leads.
(See (6) Motor resistance table
(page 36).)
If the measured value is significantly
different from the values specified in
the table, replace the fan motor.
Replace the circuit board.
Check the connector (CN22) con-
nection.
Disconnect the connector (CN22),
and check the resistance of the
thermistor.
If the equivalent thermistor re-
sistance differs greatly from the
ambient temperatures, replace the
thermistor. (See (5) Temperatures
and thermistor resistance table
(page 36).)