Daikin RZQ100B8V3B Service Manual page 233

ESIE05-03
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Part 3 – Troubleshooting
Check the
installation conditions.
NO
Is the stop valve open?
YES
Is the
difference between
NO
high and low pressure
before startup not more
than 0.2MPa?
YES
Turn the main power supply
off, and then disconnect the
connection between the
compressor and inverter.
Check 5.9.4
NO
Continuity check in the
power transistor (IGBT)
Is the continuity
normal?
YES
Is the
inverter output
voltage generated
approximately at the same NO
increasing speed on each
∗ When operating compressor
phase after turning
on again? (∗)
with compressor output line
(U-V, V-W, disconnected, the compressor
W-U)
stops due to malfunction after
elapsed time of 5 seconds.
Therefore, check the voltage
increase for 5 seconds.
YES
Error Codes: Outdoor Units
Open the stop valve.
Insufficient pressure equalization
Check refrigerant system.
Replace the inverter PC board.
Replace the inverter PC board.
Compressor inspection
Inspect according to the diagnosis
procedure for abnormal noises,
vibration, operating status, etc. of the
compressor.
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5
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