Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 179
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 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 indoor PC board [A4P (1ø) or A5P (3ø)]
 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 indoor PC board
[A4P (1
ø) or A5P (3ø)].
(PC board equipped with a
resin case)

Daikin Altherma HT Specifications

General

Type	Air-to-water heat pump
Refrigerant	R-410A
Water Outlet Temperature	Up to 80°C
Operating Temperature Range	-20°C to 35°C
Power Supply	3-phase, 400V
Energy Efficiency Class (Heating)	A++