Mitsubishi Electric Lossnay VL-250CZPVU-L-E Handbook page 37

No. Symptom
6 The product gener-
ates vibration.
The product gener-
ates vibration noise.
7 Operating noise has
increased.
Operating noise has
decreased.
Cause
The filter cases are not inserted to the
deepest position correctly.
Clogged filter
Any fixing screw is loose.
Vibration noise from the duct pipe
Pressure loss in the duct pipe is too high. If there is a foreign substance at any ter-
Vibration noise from the drain pipe
Foreign substance is attached to the fan. Remove the foreign substance.
The fan is loose or disengaged.
The fan is swinging.
Check if the fan rotation has increased,
decreased or stopped due to Automatic
supply air stop/Automatic supply air
intermittent operation because of the
decrease in outside air temperature.
* During icing suppress operation the
icon " " is displayed on the controller.
Check if the symptom is caused by the
control mode specifically set. (Refer to
the Instruction Manual and Installation
Manual for the modes.)
* A displayed icon on the controller does
not indicate ON/OFF status of the set-
ting. (The icon appears whenever the
control is in effect.)
Check if it is affected by the outdoor wind. It is normal.
Check if it is affected by the indoor pres-
sure due to another air-conditioner.
The filter cases are not inserted to the
deepest position correctly.
Clogged filter
Foreign substance is attached to the fan. Remove the foreign substance.
The fan is loose or disengaged.
Pressure loss in the duct pipe is too high. If there is a foreign substance at any ter-
Insert the filter cases to the deepest posi-
tion correctly.
Clean or replace the filters.
(Refer to the Instruction Manual for the
cleaning procedure.)
Tighten the screws correctly.
• Check if the duct pipe connection is
loose, and reinforce the connection if it
is loose.
• Check if the duct pipe fixing is loose,
and reinforce the fixing if it is loose.
minal part such as grill or hood, remove it.
• Check if the drain pipe connection is
loose, and reinforce the connection if it
is loose.
• Check if the drain pipe fixing is loose,
and reinforce the fixing if it is loose.
Tighten the fan.
Tighten the fan.
Fan rotation speed may change or the
fan may stop due to Automatic supply
air stop/Automatic supply air intermittent
operation, however, it is normal.
* Fan rotation speed may also change
immediately after the icing suppress
operation ends (the icon disappears
from the controller) by returning to the
normal operation.
Change the setting if the operation noise
is abnormal.
It is normal.
When another ventilator such as a range
hood fan operates, the indoor pressure
can change and affect the fan speed of
the product.
Insert the filter cases to the deepest posi-
tion correctly.
Clean or replace the filters.
(Refer to the Instruction Manual for the
cleaning procedure.)
Tighten the fan.
minal part such as grill or hood, remove it.
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Corrective action