Daikin VRVIII-S, Service Manual

Page: 168 / 266

SiENBE34-703 Troubleshooting by Indication on the remote control
Troubleshooting 157
3.30 “
L1
” Outdoor Unit: Malfunction of PC Board
remote control
Display
L1
Applicable
Models RXYSQ4~6P
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.
Malfunction
Decision
Conditions ! In case of overcurrent (OCP) during waveform output
! When the current sensor malfunctions during synchronized operation
!
In case of IGBT malfunction
Supposed
Causes ! Faulty outdoor PC board (A1P)
•
IPM failure
•
Current sensor failure
•
Failure of IGBT or drive circuit
Troubleshooting
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
( )
YES
NO
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution