Models 3.2 - 13.2, controller µchiller
Blue Box - Page 67
SYMPTOM
OPERATION
PROBABLE CAUSE
POSSIBLE CORRECTIVE ACTION
COOLING
HEATING
I)
Compressor 1 and/or 2
not working (display
⊗ ⊗
Circuit overcharged (only
version LC and LC/HP)
Check refrigerant charge and
remove if necessary;
On with alarm
“H1” and/or “H2”)
⊗ ⊗
High pressure switch faulty Check and replace if necessary
⊗ ⊗
Coil filters clogged; air flow
too low (version LC and
LC/HP)
Clean filters with compressed air
⊗ ⊗
Presence of incondensable
gas in the refrigerant circuit
Empty circuit, apply vacuum, and
recharge
⊗ ⊗
Fans faulty (version LC and
LC/HP)
Check and replace fans
⊗ ⊗
Faulty circulating pump Check and replace
⊗
Defrost-end pressure switch
not working (only version
LC/HP)
Check and replace
⊗ ⊗
Metallic filter of condenser
clogged
Clean filter
⊗ ⊗
Insufficient condenser
water flow
Check hydraulic circuit and
condenser water flow
⊗ ⊗
Condenser entering water
temperature too high
Check condenser hydraulic circuit
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