Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 55

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
Note:
LED Green Red
– –
Indoor
– –
Outdoor
5. Troubleshooting
Diagnosis
From 2/3
[Adjustment
during commissioning]
Does noise/vibration occur when the
cooling/heating operation is performed
under anomalous
condition?
53
–
Content
Excessive noise/vibration (3/3)
YES
–
Countermeasure
If insufficient cooling/
heating problem happens
due to anomalous operating
conditions at cooling
/heating, followings are
suspicious.
• Excessive charged
amount of refrigerant
• Insufficient charge
amount of refrigerant
• Intrusion of air, nitrogen,
etc.
In such case, it is necessary
to recover refrigerant,
vacuum-dry and recharge
refrigerant.
* Since there could be
many causes of noise/
vibration, the above may
not cover all.
In such case, check the
conditions when, where,
how the noise/vibration
occurs according to
following check points and
ask our consultation
• Indoor/outdoor unit
• Cooling/heating/fan
mode
• Startup/stop/during
operation
• Operating condition
(Indoor/outdoor
temperatures and
pressures)
• Time it occurred
• Operation data retained
by remote controller
or Mente PC such as
compressor rotation
speed, heat exchanger
temperature, EEV
opening degree and etc.
• Tone (If available, record
the noise)
• Any other anomalies