Mitsubishi Electric Lossnay VL-250CZPVU-L-E Handbook page 29

Failure mode 2 The controller does not work.
If the controller does not work, check the following items.
No. Symptom
1 Nothing is displayed
on the screen.
The ON/OFF lamp
does not blink.
2 The controller con-
tinues to display
"Please Wait".
Error code "6831" is
displayed.
3 It takes time for the
controller to be fed
with power after
turning the power
to the Lossnay unit
ON.
[Nothing is displayed on the controller]
[1] If the ON/OFF lamp does not light (or blink) and nothing is displayed on the LCD screen, check the
following:
a. Inter-terminal voltage at the terminal block in the bottom case of the controller is approximately 12 V.
Check that the bottom case connector is firmly engaged with the top case connector.
b. Inter-terminal voltage at the terminal block in the bottom case of the controller is approximately 0 V.
• All LEDs on the Lossnay control circuit board are not lit.
The power of the Lossnay unit may not turned on. Check the power of the Lossnay unit.
• LED1 on the Lossnay control circuit board blinks 11 times.
Check that a 2-core sheathed 0.3 mm
controller cable.
Power off the Lossnay unit and check if the controller cable is short-circuited.
If it is short-circuited, check connection between the controller and Lossnay terminal block as
well as damage of the controller cable.
[2] If the ON/OFF lamp lights but nothing is displayed on the LCD screen, check the following:
• The ON/OFF lamp remains blinking or pressing the ON/OFF button after the lamp turns off does not
start the Lossnay unit.
Power off the Lossnay unit and power it on again after a while.
• Pressing the ON/OFF button after the ON/OFF lamp turns off starts the Lossnay unit.
The LCD screen of the controller may be faulty. Replace the controller.
Cause
The power of the Lossnay unit is not ON. Refer to section [1] of "Failure mode 1".
Faulty connection of the controller cable Refer to section [2] of "Failure mode 1".
The wiring length of the controller
exceeds 200 m.
The controller is connected to the incor-
rect terminal block (TB5 [A] [B]).
If the above does not solve the problem
The controller is starting up.
Faulty connection of the controller cable Refer to section [2] of "Failure mode 1."
The controller is connected to the incor-
rect terminal block (TB5 [A] [B]).
The separately sold controller is
connected.
Lossnay units and the air conditioner
(Mr. Slim) units are connected within the
same group.
The Lossnay unit is starting up.
The wiring length of the controller shall be
within 200 m.
Connect the controller cable to the termi-
nal block (TM4 [1] [2]).
Refer to [Nothing is displayed on the con-
troller] (page 29).
The controller displays "Please Wait" dur-
ing start-up for maximum three minutes.
Connect the controller cable to the termi-
nal block (TM4 [1] [2]).
Use the supplied controller.
Assign the Lossnay units and air con-
ditioner (Mr. Slim) units to the different
groups.
The controller is not fed with power during
start-up of the Lossnay unit for a maxi-
mum of one minute.
2 cable of up to 200 m in length is used for the remote
─ 29 ─
Corrective action