ESIE09-08A Troubleshooting by Indication on the Remote Controller
Troubleshooting 189
3.38 “L1 ” Indoor Unit: Malfunction of PC Board
Remote Control
Display
L1
Subcode 30
Applicable Models All indoor units
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 indoor PC board [A4P (1ø) or A5P (3ø)]
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 indoor PC board
[A4P (1
ø) or A5P (3ø)].
(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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