Daikin Super Multi Plus E-Series, Service Manual

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Troubleshooting for Outdoor Unit SiEN18-622
378 Troubleshooting
7.17 Malfunction of PCB
Remote Control
Display
L1
Applicable
Models AII outdoor unit models
Method of
Malfunction
Detection „ Detect malfunctions by current value during waveform output before compressor startup.
„
Detect malfunctions by current sensor value during synchronized operation at the time of
startup.
„ Detect malfunctions using an SP-PAM series capacitor overvoltage sensor.
Malfunction
Decision
Conditions „ In case of overcurrent (OCP) during waveform output
„
When the current sensor malfunctions during synchronized operation
„ When overvoltage occurs in SP-PAM
„ In case of IGBT malfunction
Supposed
Causes „ Faulty outdoor PCB (A1P)
•
IPM failure
•
Current sensor failure
•
SP-PAM failure
•
Failure of IGBT or drive circuit
Troubleshooting
YES
NO
Turn OFF the power
supply once and then turn
it ON again.
Does
it return normally?
It is believed that
external factors (noise,
etc.) other than failure
caused the malfunction.
Replace the outdoor PC
board (A1P).
PC board equipped with
a resin case
( )
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.