Service Manual

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Error
Code
LED1
(green)
LED2
(red)
Symptom Cause Corrective action
4116 2
blinks
or
7
blinks
(*2)
Abnormal
rotation of the
exhaust fan
motor
(Centrifugal fan
does not work,
insufficient
motor speed,
excessive
motor speed,
or rotation
detected when
operation is
stopped)
Faulty connection of the exhaust fan
motor connector (CN9) on the power
circuit board
Check the connector (CN9)
connection.
<For LGH-F300 to 600 types>
Faulty connection of the connectors
(CN19–CN119) between the control
circuit board and power circuit board
Check the connector connections
(CN19 – CN119).
<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)
Check the connector connections
(CN19–CN119) and (CN21–CN121).
The model selection switch (SW6) is
not set correctly.
Make the SW6 setting appropriate
for the model.
(See Chapter 8. (8) Setting status
record (page 52).)
The temperature around the product
is high.
Use the product at a temperature
of 104°F (40°C) or lower.
The motor and centrifugal fan are not
fixed securely.
Check the installation state of the
motor and centrifugal fan, and fix
them securely.
Deformed centrifugal fan Replace the centrifugal fan.
Foreign objects around the centrifu-
gal fan
Check the air course and around
the centrifugal fan, and remove
any foreign matter.
Fan motor failure Replace the fan motor.
(See page 19.)
Circuit board failure Replace the power circuit board.
When operation is stopped, the
exhaust fan rotates due to outside
wind.
Prevent the outside wind from
intruding.
5101 4
blinks
Outdoor air
(OA) thermis-
tor related
error
Faulty connection of the thermistor
connector (CN7) on the control cir-
cuit board
Check the connector (CN7)
connection.
Thermistor failure 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).)
(*2) 2 blinks for LGH-F300 to 600 types
2 or 7 blinks for LGH-F940 and 1200 types