Daikin MICROTECH III Operating Manual page 62

10.10.3 Failed Pumpdown
This event can indicate a wrong operation of the exv that needs to be checked.
Symptom
Circuit status is
Off: Ready
Pumpdown procedure is ended for
timeout.
String in the Event log:
Cx PdFail
10.10.4 Power Loss While Running
This event indicates a power loss while the compressor was running.
Symptom
Circuit status can be any depending
on the actual situation.
String in the Event log:
C# PwrLossRun
D–EOMWC00A07-16_02EN
Cause
Wrong operation of the exv which
doesn't close.
Cause
Power failure to the unit
Operation Manual
Solution
Check the exv driver to verify that it
can correctly move the valve. The
LEDs on the driver should show the
"C" LED solid green.
Check the proper electrical
connection of the exv to the driver. If
the "C" and "O" LED blink
alternatively the driver sees the motor
as disconnected.
Check if any debris can hold the valve
from moving. Dismount the motor and
check for scratches on the shutter.
Measure the winding resistance and
compare with the exv datasheet.
Solution
Check if this events are too frequent
and eventually check with the local
maintenance.
Check the fuses. In this case the
compressor should not be able to
start.
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