Daikin RZQ100B8V3B Service Manual page 245

ESIE05-03
Troubleshooting 2
Check the normal
HAP of the
microcomputer
for outdoor unit.
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Part 3 – Troubleshooting
From the preceding page
Is the HAP
NO (ON or OFF)
blinking?
YES
YES
"U4" is displayed
at all times.
NO
Error Codes: System Malfunctions
Turn OFF the power supply
once and then ON again.
YES
Is the HAP blinking?
NO
YES
Is the HAP ON?
NO (OFF)
Check the connector of
the fan motor
Does
the resistance
between VCC and
NO
UVW, GND-UVW of the
signal line keep the
balance?
Turn OFF the power supply
and disconnect No.3 wire of
the Indoor-Outdoor connection
wiring, and then turn ON the
power supply again.
YES
YES
Is the HAP blinking?
NO
Reset to normal.
External factors (e.g. noises)
are supposed.
Faulty outdoor unit PC board.
Replace the fan motor.
Faulty indoor unit PC board.
Malfunction in the power
supply system or faulty
outdoor unit PC board.
Faulty indoor unit PC board.
External factors (e.g. noises)
are supposed.
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