Mitsubishi Electric Lossnay VL-250CZPVU-L-E Handbook page 33

Failure mode 5 Error code and LED error display
An error code displayed on the controller and the number of blinks of LED1 (green) on the control circuit board
show the type of an error. The LED blink interval is 0.25 seconds for both ON and OFF. The display duration is
approximately 7 seconds.
Error indication list
Error code
LED1
(Controller
(green)
display)
0900 - Trial operation
4101 11 Overcurrent
blinks error of the con-
troller terminal
4116 1 Abnormal rota-
blink tion of the sup-
ply air (SA) fan
motor
2 Abnormal rota-
blinks tion of the
exhaust air (EA)
fan motor
0.25 0.25
sec. sec.
ON
OFF
Approximately 7 sec.
Error indication example of LED (two blinks)
Error
The trial operation switch (SW2-1)
on the control circuit board is set to
"ON".
Short-circuiting between controller
terminals
Controller failure
Circuit board failure
Foreign substance is attached to the
centrifugal fan.
The fan touches the casing.
[1] Any fixing nut is loose.
[2] The casing is deformed or
disengaged.
The SA fan motor connector CN10
on the circuit board is not firmly
connected.
The EA fan motor connector CN9
on the circuit board is not firmly
connected.
The fan cannot be turned manually.
The following voltages are not output
from the connectors on the circuit board.
• EA side:
Disconnect the connector CN9 and
check that the voltage between
pins 1 and 4 is 280 to 360 V DC.
• SA side:
Disconnect the connector CN10
and check that the voltage between
pins 1 and 3 is 280 to 360 V DC.
0.25
sec.
Cause
─ 33 ─
Corrective action
Check the trial operation switch.
Check connection between the
control circuit board and the con-
troller cable.
Check for short-circuit with the
transmission cable on the control-
ler wiring.
Replace the controller.
If the problem persists, replace the
control circuit board.
Remove it.
[1] Tighten the nuts.
[2] Check for fixing and replace
any faulty parts.
Connect the connector securely.
Connect the connector securely.
If the fan does not turn, diagnose
the DC motors on the EA and SA
sides as directed in "[3] Diagnosis
of the power circuit board and DC
motor" in "Failure mode 7".
Perform the following diagnosis
as directed in "[3] Diagnosis of the
power circuit board and DC motor"
in "Failure mode 7".
• Output detected
Diagnose the DC motor on the
EA and SA sides.
• Output not detected
Diagnose the power circuit
board.