P1" Indoor Unit: High Voltage Of Capacitor In Main Inverter Circuit - Daikin ALTHERMA HT Service Manual

Troubleshooting by Indication on the Remote Controller
3.51 "P1 " Indoor Unit: High Voltage of Capacitor in Main
Inverter Circuit
P1
Remote Control
Display
Subcode 6
All indoor units
Applicable
Models
Malfunction is detected according to the voltage waveform of main circuit capacitor built in the
Method of
inverter.
Malfunction
Detection
When the aforementioned voltage waveform becomes identical with the waveform of the power
Malfunction
supply open phase.
Decision
Conditions
 Defect of main circuit capacitor
Supposed
 Improper main circuit wiring
Causes
 Defect of indoor unit inverter PC board [A4P (1ø) or A5P (3ø)]
 Imbalance of phase-to-phase voltages
 Open phase
Troubleshooting
192
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Caution
Make measurement of power
supply voltages between L1 and
L2, L1 and L3, and L2 and L3.
Have the
power supply voltages of
three phases fallen within the range
of rated voltage ±10%?
YES
Has the
imbalance of
phase-to-phase voltages
fallen within
±10%?
YES
NO
NO
ESIE09-08B
Correct the power supply voltages.
Correct the power supply voltages.
Replace the inverter PC board assy
ø ø
[A4P (1 ) or A5P (3 )].
Troubleshooting