Service manual

Troubleshooting by Indication on the Remote Controller ESIE09-08A
188 Troubleshooting
3.37 “L1 ” Outdoor Unit: Malfunction of PC Board
Remote Control
Display
L1
Applicable Models ER*Q 011~016*
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)
 Over current
 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 connecting or disconnecting connector,
otherwise parts may be damaged.