L1" Indoor Unit: Malfunction Of Pc Board - Daikin ALTHERMA HT Service Manual

ESIE09-08B

3.38 "L1" Indoor Unit: Malfunction of PC Board

L1
Remote Control
Display
Subcode 30
All indoor units
Applicable
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
 In case of overcurrent (OCP) during waveform output
Malfunction
 When the current sensor malfunctions during synchronized operation
Decision
 In case of IGBT malfunction
Conditions
 Faulty indoor PC board [A4P (1
Supposed
Causes
Troubleshooting
Troubleshooting
startup.
 Over current
 Current sensor failure
 Failure of IGBT or drive circuit
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Caution
Turn OFF the power
supply once and then turn
it ON again.
YES
Does it return
normally?
NO
Troubleshooting by Indication on the Remote Controller
ø ø
) or A5P (3 )]
It is believed that external
factors (noise, etc.) other
than failure caused the
malfunction.
Replace the indoor PC board
ø ø
[A4P (1 ) or A5P (3 )].
(PC board equipped with a
resin case)
179