Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 184

Error code
None
Remote control:
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
➀ Improper installation work
• Improper anti-vibration
work at instllation
• Insufficient strength of
mounting face
➁ Defective product
• Before/after shipping from
factory
➂ Improper adjustment during
commissioning
• Excess/shortage of
refrigerant, etc.
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 noise/vibration
occur not only from the
air-conditioner
but also from entire
building?
NO
[Product]
Does noise/vibration
occur from operating
fan (fan only)?
NO
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183
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Content
Excessive noise/vibration (1/3)
NO
Does the
installation of
indoor/outdoor
unit loose?
NO
Are pipes
touching the wall, etc?
NO
Is there a fan
YES
or louver touching other
components?
NO
-
'19 • PAC-T-327
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 position or
insert rubber cushions
YES
or others into the gap, if
necessary.
Prevent the vibration from
transmitting to wall and etc
by fixing pipes on the wall
or wrapping rubber cushion
around the pipe which
YES
goes through the hole in
the wall or applying other
appropriate means.
Strength of ceiling
wall, floor, etc. may be
insufficient. Review the
installing position or
reinforce it.
Check for leaning of
YES
installed unit or anomalous
mounting of fan, louver
or motor and specify the
contacting point and correct
it.
When the heat exchanger
or filter is clogged, clean
them. In case that the
unit is installed at the site
where background noise
is very low, small noise
from indoor unit can be
heard, but it is normal.
Before installation, check
for background noise. If
backgound nois is very
low, convince client prior
to installation.