Mitsubishi Electric PLA-SM71EA2 Service Manual page 33

11-3. TROUBLESHOOTING
• Check the following points.
Problem
Intake grille does not function
with operation of the remote
controller.
Intake grille cannot be placed
in the correct position.
Intake grille stops lowering in
mid flow. (Intake grille would not
lower any further.)
Noises are made during
up/down operation. (While
intake grille is moving up/down.)
Noises are made while placing
the intake grille in.
Intake grille repeats rising and
lowering several times while being
placed in the correct position.
Intake grille leans toward one side
during the up/down operation.
11-4. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION)
Note that this function is not available for SUZ, MXZ, and PUMY models.
11-4-1. Operation
(1) Rotation function (and Back-up function)
• Outline of functions
· Main and sub unit operate according to the interval of rotation setting.
Main and sub unit should be set by refrigerant address. (Outdoor DIP switch setting)
Refrigerant address "00"
Refrigerant address "01"
· When an error occurs to one unit, another unit will start operation. (Back-up function)
• System constraint
· This function is available only by the grouping control system (INDOOR UNIT: OUTDOOR UNIT=1:1) of 2 or 3 refrigerant
groups. (Refer to Fig. 1)
· Main indoor unit should be connected for wired remote controller and the transmission line (TB5) for main and sub unit
should also be connected. (Refer to Fig. 1)
(This function cannot be set by wireless remote controller.)
· Set refrigerant address of each unit. (DIP switch on the outdoor unit ··· Refrigerant address 00/01)
OCH784
Possible Reason
Air-conditioner is running.
Power failure
Batteries are not inserted into the wireless remote
controller. Or battery power is running low.
There is something on the intake grille.
Or something is stuck in the intake grille.
There is something on the intake grille.
Filter is not properly installed.
Intake grille is not hung with all 4 hooks.
Because the intake grille has finished lowering to
the auto-stop position.
This is the noise made when the string is winded
and unwound.
This is the operational noise for placing the intake
grille in securely.
This is the operation for placing the intake grille in
securely.
The speeds of winding each string is slightly
different.
Main unit
Sub unit
33
Corrective Action
Stop running the air-conditioner and try again.
After recovering from power failure, try again.
Install or replace the battery.
Remove the objects or obstacles from the
intake grille. Or, remove the stuck object.
Remove the objects or obstacles from the
intake grille.
Lower the intake grille again and check
whether the filter is installed in the correct
position.
Lower the intake grille again and hang the
hook on the intake grille.
This is normal.
Note: If you want to change the setting for the
lowering distance, contact your dealer.
This is normal.