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Troubleshooting
SiEN12-710A
136
Service Diagnosis
Troubleshooting
Check No.06
Refer to P.149
Check No.07
Refer to P.150
Check No.09
Refer to P.151
Note:
Refer to “1.3 Application of Silicon grease to a power transistor and a diode bridge” on P 182.
Make sure the power has been off
for at least 30 seconds.
(R7147)
Caution
Be sure to turn off power switch before
connect or disconnect connector, or
parts damage may be occurred.
NO
Slightly dirty
Malfunctioning
Too dirty
Functioning
NO
YES
NO
YES
Fin thermistor
WARNING
To cool down the electricals, the
outdoor unit fan gets started when
the radiation fin temperature rises
above 75°C even when the air
conditioning is not operated and
stops itself when it drops below
70°C.
(Precaution before turning on the power again)
NO
YES
YES
Replace the fin thermistor.
Check if the silicon grease
applied properly on the
radiation fin. If not, apply it
(
∗
). (Note 1)
Check the power transistor
and fin for looseness. If they
are found to be fit tightly,
replace the PCB or the
power transistor.
Replace the outdoor unit
PCB.
Replace the fan motor.
Correct the connectors and
fan motor leads.
Clean up the radiation fin.
∗
Silicon grease
Part No.: 1172698
Radiation fin dirty?
Above 90°C?
Thermistor as
specified in its characteristic
chart?
Check No. 06
Check the thermistor resistance
value.
Check No. 09
Check the outdoor unit fan or
related.
Error displayed again?
Has PCB been replaced?
Turn off the power and turn it on
again to get the system started.
Check the radiation fin
temperature.
Check No. 07
Check the installation condition.
Summary of Contents for 2MKS40FV1B
Page 11: ...Introduction SiEN12 710A x ...
Page 12: ...SiEN12 710A List of Functions 1 Part 1 List of Functions 1 Cooling Only 2 2 Heat Pump 4 ...
Page 17: ...Heat Pump SiEN12 710A 6 List of Functions ...
Page 25: ...Heat Pump SiEN12 710A 14 Specifications ...
Page 111: ...Instruction SiEN12 710A 100 Operation Manual ...
Page 199: ...Wiring Diagrams SiEN12 710A 188 Appendix ...
Page 203: ...SiEN12 710A iv Index ...