Blue Box SIGMA 2002, Installation, Installation, Operating, Operating, And Maintenance Manual

Page: 89 / 124

Models 14.4 - 26.4, controller pCO
2
Blue Box - Page 83
SYMPTOM OPERATION PROBABLE CAUSE POSSIBLE CORRECTIVE ACTION
COOLING HEATING
E7)
No compressor
running. Display On:
unit ON with alarm
“No power to Control
circuits” ⊗ ⊗ Power supply voltage not
stable Check power supply voltage; if
not correct contact the electricity
company
F1)
No compressor
running. ⊗ ⊗ No water flow to
evaporator Check hydraulic circuit
Display On: unit
OFF with alarm
“Flow Switch Alarm”
⊗ ⊗
Flow switch faulty Check flow switch contact and
replace if necessary
F2)
No compressor
running. Display On:
unit OFF with alarm
”Incorrect Phase
Sequence” and phase
sequence relay with
green LED On and
orange LED Off ⊗ ⊗ Incorrect phase sequence Invert two of the phase wires of
the power supply line
F3)
No compressor
running. Display On:
unit OFF with alarm
”Incorrect Phase
Sequence” and phase
sequence relay with
green and orange LEDs
On ⊗ ⊗ Faulty relay Check to ensure that relay closes
contact
F4)
No compressor
running. Display On:
unit OFF with alarm
⊗ ⊗
Fuses FU56 burnt-out Check fuse FU56 and replace if
necessary
”Incorrect Phase
Sequence”
and phase sequence
relay with green and
orange LEDs Off ⊗ ⊗ One of the three phases is
not present Check connection of each phase