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SiEN12-710A
Troubleshooting
Service Diagnosis
141
4.22 Over-voltage Detection / Low-voltage Detection
Remote Control
Display
U2
Method of
Malfunction
Detection
An abnormal voltage rise (or drop) is detected by checking the detection circuit or DC voltage
detection circuit.
Malfunction
Decision
Conditions
"
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or
the voltage being detected by the DC voltage detection circuit is judged to be below 150V for
0.1 second.
"
The system will be shut down if the error occurs 255 times.
"
Clearing condition: Continuous run for about 60 minutes (normal)
Supposed
Causes
"
Supply voltage not as specified
"
Over-voltage detector or DC voltage detection circuit defective
"
PAM control part(s) defective
"
Short circuit inside the fan motor winding.
Troubleshooting
Correct the power supply.
Replace the outdoor unit
PCB.
Check for such factors for a
long term.
∗
Try to get restarted a
couple of times.
(R7150)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO
YES
YES
NO
YES
(Precaution before turning on the power again)
NO
Replace fan motor and
outdoor unit PCB.
Repeat a
couple of times.
Make sure the power has been off for at
least 30 seconds.
Turn on the
power again. System
restarted?
Does fan rotate smoothly?
Rotate fan by hand.
Supply voltage as specified?
Check the supply voltage.
Disturbance factors
∗
Noise
∗
Power supply distortion
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 ...