Malfunction Of Pcb - Daikin E-Series Service Manual

Troubleshooting for Outdoor Unit
7.17

Malfunction of PCB

L1
Remote
Controller
Display
Applicable AII outdoor unit models
Models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
376
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.
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
Faulty outdoor PCB (A1P)
•
IPM failure
•
Current sensor failure
•
SP-PAM failure
•
Failure of IGBT or drive circuit
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Turn OFF the power supply
once and then turn it ON
again.
Does it return
normally?
NO
YES
SiAU18-715
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)
Troubleshooting