Mitsubishi KXZ Series Technical Manual page 240

Error code
Remote control: None
7-segment display:
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
① Improper installation work
・ I mproper vibration-proof
work at instllation
・ I nsufficient strength of
mounting surface
② Anomaly of product
・ B efore/after shipment from
factory
③ I mproper adjustment during
commissioning
・ E xcessive/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
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
223
-
Content
Excessive noise/vibration (1/3)
NO
Does
the installation
of indoor/outdoor unit have
looseness?
NO
Are pipes
touching the wall
and etc?
NO
Is fan or louver
YES touching other
components?
NO
-
'20 • KX-T-373
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, floo , etc. may be
insufficient. Review the
installation place or apply
reinforcement to increase
the strength.
Check for leaning of
installed unit or incorrect
YES
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.