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14.
TROUBLESHOOTING TABLE
SYMPTOMS
CAUSES
Suction shut off valve closed or throttled
Discharge shut off valve closed or throttled
Suction valve or piston portions unsealed
Unsealed discharge valve
Clogged discharge pipes
Clogged suction pipes, wrongly sized suction pipes or
evaporator with insufficient power
Suction pipes not correctly insulated
Expansion valve capacity too high
Expansion valve capacity too low
Lifting of deposits caused by suction of liquid or foreign
matters
Clogged liquid pipes
By-pass shut off valve opened or perforated rupture disk
Gauge not set
Imprecise thermometer
Inadequate cooling water flow
Condenser dirty inside or outside
Evaporator to be defrosted; evaporator dirty inside or
outside. Presence of oil.
Presence of air or of gas that cannot be condensed
Condensing water temperature too high
Lack of refrigerant
Excess refrigerant
Clogged suction filter
Closed shut off valve on oil return pipe
Dirty filter on oil return
Connecting rod assembly, bearings or segments worn
Clogged expansion valve filter
Lack of oil
Ice formed on expansion valve needle
Expansion valve failure
Excess oil in the circuit
Condensing water too cool or too plentiful
Insufficient air flow to the air-cooled condenser
HP pressure switch incorrectly adjusted
Evaporator fan/s motor/s not working
LP pressure switch incorrectly adjusted
Excessive cooling requested
Refrigerating unit incorrectly set
Thermostat set too high or damaged
Current interrupted: fuse blown, thermomagnetic switch
contacts damaged
Closed solenoid valve on the liquid line
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BLOCKSYSTEM FS Pag. 35 Rev. 02 02/07
UK
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