Models 14.4 - 26.4, controller pCO
2
Blue Box - Page 85
SYMPTOM
OPERATION
PROBABLE CAUSE
POSSIBLE CORRECTIVE ACTION
COOLING
HEATING
H3)
One, two or three
compressors running.
Display On with alarm
“Compressor Thermal
Protections”
⊗ ⊗
Problems at the compressor
Call service
I)
Only one compressor
⊗ ⊗
Unit capacity step active Normal operation
Running.
Display On
without alarms
⊗ ⊗
Fuses burnt-out Call service
⊗ ⊗
Controller faulty Call service
⊗ ⊗
No external consent to the
compressor
Check external consent of
compressor
L1)
All compressors
running. Display On
with alarm
“Compressor
Maintenance”
⊗ ⊗
Compressors specified by
alarm require maintenance
Call service for scheduled
maintenance
L2)
All compressors
running. Display On
with alarm “Unit
Maintenance”
⊗ ⊗
Unit maintenance required Call service for scheduled
maintenance
M)
All compressors
⊗ ⊗
Excess thermal load Call service
running without
stopping. Display
On without alarm
⊗ ⊗
Refrigerant circuits partially
discharged
Call service
⊗ ⊗
Controller not working Call service
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