Daikin Altherma HT - L1 Outdoor Unit: Malfunction of PC Board

Troubleshooting by Indication on the Remote Controller ESIE09-08B
178 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 s
ynchronized 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
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
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)