Mitsubishi Electric LGH-F300RVX2-E Handbook page 34

Error LED1 LED2
Code (green) (red)
4116 2 Abnormal
blinks rotation of the
or exhaust fan
7 motor
blinks (Centrifugal fan
(*2) does not work,
insufficient
motor speed,
excessive
motor speed,
or rotation
detected when
operation is
stopped)
5101 4 Outdoor air
blinks (OA) thermis-
tor related
error
(*2) 2 blinks for LGH-F300 to 600 types
2 or 7 blinks for LGH-F940 and 1200 types
Symptom
Faulty connection of the exhaust fan
motor connector (CN9) on the power
circuit board
<For LGH-F300 to 600 types>
Faulty connection of the connectors
(CN19–CN119) between the control
circuit board and power circuit board
<For LGH-F940 and 1200 types>
Faulty connection of the connectors
(CN19–CN119) between the control
circuit board and power circuit board
(lower unit)
(CN21–CN121) between the control
circuit board and power circuit board
(upper unit)
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
When operation is stopped, the
exhaust fan rotates due to outside
wind.
Faulty connection of the thermistor
connector (CN7) on the control cir-
cuit board
Thermistor failure
Cause
─ 34 ─
Corrective action
Check the connector (CN9)
connection.
Check the connector connections
(CN19–CN119).
Check the connector connections
(CN19–CN119) and (CN21–CN121).
Make the SW6 setting appropriate
for the model.
(See Chapter 8. (8) Setting status
record (page 52).)
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.
Replace the fan motor.
(See page 19.)
Replace the power circuit board.
Prevent the outside wind from
intruding.
Check the connector (CN7)
connection.
Disconnect the connector (CN7),
and check the resistance of the
thermistor.
If the equivalent thermistor resis-
tance differs greatly from the
ambient temperatures, replace the
thermistor.
(See (5) Temperatures and therm-
istor resistance table (page 39).)