Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 30

Error LED1 LED2
Code (green) (red)
4116 2 Abnormal
blinks rotation of the
exhaust fan
motor
(Centrifugal fan
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
5102 5 Return air
blinks (RA) thermis-
tor related
error
Symptom
Faulty connection of the exhaust fan
motor connector (CN9) on the power
circuit board
Faulty connection of the connectors
(CN14 - CN114 and CN19 - CN119)
between the control circuit board and
power circuit board
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
Faulty connection of the thermistor
connector (CN5) on the control cir-
cuit board
Thermistor failure
Cause
─ 30 ─
Corrective action
Check the connector (CN9)
connection.
Check the connector connections
(CN14 - CN114 and CN19 - CN119).
Make the SW6 setting appropriate
for the model.
(See Chapter 7. (9) Setting status
record (page 47).)
Use the product at a temperature
of 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 16.)
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 34).)
Check the connector (CN5)
connection.
Disconnect the connector (CN5),
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 thermistor resistance table
(page 34).)