Troubleshooting for Outdoor Unit SiAU18-715
376 Troubleshooting
7.17 Malfunction of PCB
Remote
Controller
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
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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
( )
(Q0566)
YES
NO
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