─ 41 ─
No.
Symptom
Cause
Corrective action
6 The product gener-
ates vibration.
The product gener-
ates vibration noise.
The filter cases are not inserted to the
deepest position correctly.
Insert the filter cases to the deepest posi-
tion correctly.
Clogged filter
Clean or replace the filters.
(Refer to the Instruction Manual for the
cleaning procedure.)
Any fixing screw is loose.
Tighten the screws correctly.
Vibration noise from the duct pipe
• 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.
Pressure loss in the duct pipe is too high. If there is a foreign substance at any ter-
minal part such as grill or hood, remove it.
Vibration noise from the drain pipe
• 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.
Foreign substance is attached to the fan. Remove the foreign substance.
The fan is loose or disengaged.
Tighten the fan.
The fan is swinging.
Tighten the fan.
7 Operating noise has
increased.
Operating noise has
decreased.
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.
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.
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.)
Change the setting if the operation noise
is abnormal.
Check if it is affected by the outdoor wind. It is normal.
Check if it is affected by the indoor
pressure change due to another
air-conditioner.
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.
The filter cases are not inserted to the
deepest position correctly.
Insert the filter cases to the deepest posi-
tion correctly.
Clogged filter
Clean or replace the filters.
(Refer to the Instruction Manual for the
cleaning procedure.)
Foreign substance is attached to the fan. Remove the foreign substance.
The fan is loose or disengaged.
Tighten the fan.
Pressure loss in the duct pipe is too high. If there is a foreign substance at any ter-
minal part such as grill or hood, remove it.
