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
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