Daikin ALTHERMA HT ERSQ 011 AA Service Manual page 219

ESIE09-08A
When the compressor is running,
measure the voltage between + and -
of electrolytic capacitor (C+, C-).
1: Inverter's Power Transistors Check : Refer to information on P.255~257.

Check No.3
Troubleshooting
Be sure to turn off power switch before connecting or disconnecting connector,
Caution
otherwise parts may be damaged.
Have the
power supply
voltages between L1 and L2,
L2 and L3, and L1 and L3 fallen within
the range of 380 to 415V±10% (50 Hz) and
between L and N within the range
of 220 to 240V±10%
(50 Hz)?
YES
Check the inverter power
transistor. *1
Is the power
transistor faulty?
NO
Check No.3
Is the resistance above
standard value?
YES
Is the
measured voltage 220
VDC or more?
NO
: Refer to information on P.221.
Troubleshooting by Indication on the Remote Controller
NO
YES
NO
YES
Correct the power supply
voltages.
If L2 or Phase N is open,
replace the switch box.
Replace the inverter PC board
assy [A4P (1Ø) or A5P (3Ø)].
Check for the PC board
conditions.
In case of significant failure,
the PC board may have got
faulty due to faulty compressor.
Consequently, even if the PC
board is replaced, it may get
faulty again. To avoid that,
recheck the compressor for
grounding and for any broken
wires. Furthermore, even after
replacing the PC board, carry
out inspections on the
compressor.
Replace the fan motor
Monitor the voltage
(Instantaneous voltage drop)
Replace the inverter PC board
[A4P (1ø) or A5P (3ø)].
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