Malfunction Of Pcb - Daikin E-Series Service Manual

Troubleshooting for Outdoor Unit

7.17 Malfunction of PCB

L1
Remote Control
Display
Applicable
AII outdoor unit models
Models
" Detect malfunctions by current value during waveform output before compressor startup.
Method of
" Detect malfunctions by current sensor value during synchronized operation at the time of
Malfunction
Detection
" Detect malfunctions using an SP-PAM series capacitor overvoltage sensor.
" In case of overcurrent (OCP) during waveform output
Malfunction
" When the current sensor malfunctions during synchronized operation
Decision
" When overvoltage occurs in SP-PAM
Conditions
" In case of IGBT malfunction
" Faulty outdoor PCB (A1P)
Supposed
Causes
Troubleshooting
326
startup.
• 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
SiENBE18-621
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)
Troubleshooting