OM 1263 • MICROTECH UNIT CONTROLLER 74 www.DaikinApplied.com
The Check 1, Check 2 and Check 3 procedures on page 74 and 75 are used to troubleshoot many error codes.
CHECK 1
Check on connector of fan motor (Power supply cable)
1. Turn OFF the power supply.
Measure the resistance between phases of U,V,W at the
motor side connectors (three-core wire) to check that
the values are balanced and there is no short circuiting,
while connector or relay connector is disconnected.
CHECK 2
1. Turn OFF the power supply.
2. Measure the resistance between Vcc and each phase
of U, V, W, and GND and each phase at the motor side
connectors (ve-core wire) to check that the values are
balanced within the range of ± 20 %, while connector or
relay connector is disconnected. Furthermore, to use a
multiple meter for measurement, connect the probe of
negative pole to Vcc and that of positive pole to GND.
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