Models 14.4 - 26.4, controller pCO
2
Blue Box - Page 80
SYMPTOM
OPERATION
PROBABLE CAUSE
POSSIBLE CORRECTIVE ACTION
COOLING
HEATING
A)
No compressor running
(display Off)
⊗ ⊗
No mains power Check presence of mains power
⊗ ⊗
Main power switch Off
(position "O")
Turn main power selector to
position "I"
⊗ ⊗
Transformer fuses and/or
fuses 24 V burnt-out
Check fuses and if necessary
replace burned out fuses (FU50
and FU51). If fuses burn-out
again call for assistance
⊗ ⊗
Electronic control card
faulty
Call assistance
B)
No compressor
running. Display On:
”OFF from external
consent”
⊗ ⊗
No external consent Check presence of external
consent; if not present, bridge
terminals 1 and 2
C)
No compressor
running. Display On:
”OFF from supervision
system”
⊗ ⊗
No consent from
supervision system
Activate operation from
supervision system
D)
No compressor
running. Display On:
”OFF”
⊗ ⊗
No consent from “on/off”
key of user interface
Press “on/off” key
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