Daikin ERQ Service Manual page 220

Troubleshooting by Indication on the Remote Controller
Troubleshooting
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.235~236.
∗
Check No.3
210
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Have the
power supply voltages
between L1 and L2, L2 and L3,
NO
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
YES
transistor faulty?
NO
∗
Check No.3
NO
Is the resistance
above standard
value?
YES
YES
Is the measured voltage
220 VDC or more?
NO
: Refer to information on P.226.
Correct the power supply
voltages.
If L2 or Phase N is open,
replace the switch box.
Replace the inverter PC board
assy (A2P).
Replace the fan motor
Monitor the voltage
(Instantaneous voltage drop)
Replace the inverter PC board
(A1P).
: http://splitoff.ru/tehn-doc.html
ESIE09-05
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.
(S2605)
Troubleshooting