Daikin ERQ, Service Manual

Page: 210 / 260

Troubleshooting by Indication on the Remote Controller ESIE09-05
200 Troubleshooting
3.31 “
L1
” Outdoor Unit: Malfunction of PC Board
Remote
Controller
Display
L1
Applicable
Models
ERQ 125 ~ 200 A7V1
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
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.
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