Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 53

Error code
None
Remote controller:
7-segment display:
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
➀ Improper installation work
・Improper vibration-proof
work at instllation
・Insufficient strength of
mounting surface
➁ Anomaly of product
・Before/after shipment from
factory
➂ Improper adjustment during
commissioning
・Excessive/insufficient
refrigerant.
Note:
LED Green Red
– –
Indoor
– –
Outdoor
5. Troubleshooting
Diagnosis
Does noise/
vibration occur during
or soon after stopping
operation of
air-conditioner?
YES
[Installation work]
Does the noise/vibration
occur not only from the
air-conditioner but also
from entire
building?
NO
[Units]
Does noise/vibration
occur when only the fan
is operating?
NO
To 2/3
51
–
Content
Excessive noise/vibration (1/3)
NO
Does
the installation
of indoor/outdoor unit have
looseness?
YES
NO
Are pipes
touching the wall
and etc?
NO
Is fan or louver
YES
touching other
components?
NO
–
Countermeasure
If excessive noise/vibration
persists when sufficient
time has elapsed after
stopping the unit, it is
considered that the air-
conditioner is not the
source.
Check the installed
condition carefully, and
correct the installed
position or insert rubber
YES
cushions into the gap or
take other measure in order
to eliminate looseness.
Prevent the vibration from
transmitting to wall and etc
by fixing pipes on the wall
tightly or wrapping rubber
YES
cushion around the pipe
which goes through the
hole in the wall or applying
other appropriate means.
Strength of ceiling
wall, floor, etc. may be
insufficient. Review the
installation place or apply
reinforcement to increase
the strength.
Check for leaning of
YES
installed unit or incorrect
mounting of fan, louver or
motor, and then specify the
contacting point and correct
it.
When th eheat exchanger
or filter is clogged, clean
them.
In case that the unit is
installed at the site where
background noise is very
low, even the low level
noise from indoor unit like
as refrigerant flow noise can
be heard, but it is normal.
Before installation, check
for background noise. If
background noise is very
low, convince client prior
to installation