Mitsubishi Electric MSH-GD80VB-E1, Руководство по обслуживанию

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10-3. TROUBLESHOOTING CHECK TABLE
No.
1
2
4
6
7
Symptom Operation indicator lamp Condition Remedy
0.5-second ON
0.5-second OFF
Mis-Wiring
Outdoor
thermistor
Outdoor
control
system
Indoor coil
thermistor
3 minutes after power supply turns ON,
serial signal is not received.
<Thermistor short>
Thermistors are abnormal when they short
after compressor start-up.
<Thermistor open>
Thermistors are abnormal when they open
after compressor start-up.
However, discharge temperature thermistor is
abnormal when open circuit is detected more
than 10 minutes after compressor start-up.
It cannot properly read data in the nonvolatile
memory of the deicer P.C. board.
• Shortage of refrigerant
• Check the deicer P.C. board.
Refer to "Check of outdoor
thermistor". Refer to outdoor
service manual.
• Check the deicer P.C. board.
Refer to outdoor service
manual.
3 Indoor fan
motor
Low
discharge
temperature
protection
Discharge temperature has been 50
or less on cool operation, or has been 49
or less on heat operation for 20 minutes.
Abnormal
point
Outdoor unit
does not
operate.
Room
temperature
thermistor
2-time flash
2.5-second OFF
Indoor coil/room temperature thermistor
detects short or open circuit every 8 seconds
during operation.
• Refer to the characteristics
of indoor coil thermistor, and
room temperature thermistor
on 10-6.
3-time flash
2.5-second OFF
Indoor fan repeats
12 seconds ON
and 3minutes OFF.
When the indoor
fan breaks, the fan
keeps stopping.
The rotational frequency feedback signal is
not emitted for 12 seconds after indoor fan
motor is operated.
• Refer to 10-5. "How to
check mis-wiring ".
• Refer to 10-5. "Check of
indoor fan motor".
4-time flash
2.5-second OFF
Indoor
control
system
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
• Check the indoor electronic
control P.C. board.
6-time flash
2.5-second OFF
• Refer to "Check of LEV".
• Check refrigerant circuit and
refrigerant amount.
Refer to outdoor unit service
manual.
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
5
7-time flash
2.5-second OFF
10-time flash
2.5-second OFF
Lighted
Not lighted
• Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and the following detection method has detected an abnormality
(the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor
with the OPERATION INDICATOR lamp flashing.
· Flashing of the OPERATION INDICATOR lamp (the left-hand side lamp)
indicates possible abnormalities.
OBH513A