Daikin MICROTECH III Operating Manual page 53

10.8.9 No Pressure Change After Start
This alarm indicates that the compressor is not able to start or to create a certain minimum variation of the evaporating
or condensing pressures after start.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller's
display.
String in the alarm list:
Cx OffNoPressChgStart
String in the alarm log:
Cx OffNoPressChgStart
String in the alarm snapshot
Cx OffNoPressChgStart
Reset
Local HMI
Network
Auto
10.8.10 No Pressure At Startup
This alarm is used to indicate a condition where the pressure at the evaporator or at the condenser is lower than 35kPa,
so the circuit is potentially empty of refrigerant.
Symptom
Circuit status is Off.
The compressor does not start
Bell icon is moving on controller's
display. String in the alarm list:
Cx OffNoPressAtStart
String in the alarm log:
Cx OffNoPressAtStart
String in the alarm snapshot
Cx OffNoPressAtStart
Reset
Local HMI
Network
Auto
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Cause
Compressor cannot start.
Compressor is turning in wrong
direction.
Refrigerant circuit is empty of
refrigerant.
Not proper operation of evaporating
or condensing pressure transducers.



Cause
Evaporator or condenser pressure
are below 35kPa



Operation Manual
Solution
Check if the start signal is properly
connected to the inverter.
Check correct phases sequence to
the compressor (L1, L2, L3)
according to the electrical scheme.
Inverter is not properly programmed
with the right direction of rotation.
Check circuit pressure and presence
of refrigerant.
Check proper operation of
evaporating or condensing pressure
transducers.
Notes
Solution
Check transducers calibration with an
appropriate gauge.
Check transducers cabling and
readout.
Check refrigerant charge and set it to
the proper value.
Notes
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