Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 187
3.46 “L9 ” Indoor Unit: Inverter Start up Error
Remote Control
Display
L9
Subcode 9
Applicable
Models
All indoor units
Method of
Malfunction
Detection
Malfunction is detected from current flowing in the power transistor.
Malfunction
Decision
Conditions
When overload in the compressor is detected during startup
Supposed
Causes
 Defect of compressor
 Pressure differential start
 Defect of outdoor unit PC board [A4P (1
ø) or A5P (3ø)]
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Inverter
output voltage
check Inverter output
voltage is not balanced.
(Normal if within ±5V) Must be
measured when
frequency is stable.
Unsatisfactory pressure equalization
Check refrigerant system.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
YES
Replace the inverter PC board
assy [A4P (1
ø) or A5P (3ø)].
NO
NO
Reset and restart.
NO
The
dierence between
high and low pressure when
starting is above
0.2MPa.
YES
YES
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode ON by
service mode.
After turning on
again, “L9”- “09” blinks
again.

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++