O - other possible causes

I - most probable cause

problem

Causes

Comp-ressor dis-charge pressure too high

Comp-ressor dis-charge pressure too low

POA valve inlet pressure too high

POA valve inlet pressure too low

Nozzle outlet temp-erature too warm

Nozzle outlet temp-erature too cold

Blown thermal limiter

Comp-ressor clutch slips

Evap-orator pressure too high

Water blowing out the dis-charge nozzle onto floor

Comp-ressor not oper-ating

Engine overheated

I

O

O

O

Air in system or overcharged

I

O

O

O

Condenser plugged

I

O

O

O

Receiver/dehydrator plugged

I

O

O

O

Hi pressure line plugged

I

O

O

O

O

O

O

Condenser air flow plugged

I

O

O

O

O

POA inlet pressure too high

I

Insufficient refrigerant

I

O

I

I

O

Defective compressor

I

O

O

O

O

I

Refrigerant system plugged

O

I

O

O

O

O

O

O

O

POA inlet pressure too low

I

O

O

O

POA valve stuck open

O

O

O

O

Capillary tube to evap. tube contact

O

I

O

O

I

O

Expansion valve inoperable

O

O

I

O

I

I

O

I

O

Inlet screen/valve plugged

O

I

O

O

O

System hoses plugged

O

O

I

O

O

O

O

O

O

Evaporator inlet case leak

O

O

I

Evaporator heater case leak

O

O

I

Evaporator drain plugged

I

Air ducts loose/disconnected

O

O

I

O

Vacuum hoses plugged/off

I

O

P.O.A. valve faulty

I

I

I

Low charge/discharged

O

O

O

O

I

O

O

Thermal limiter wrong

I

O

Thermal limiter blown

I

Bad superheat shut off

I

O

Head pressure too high

I

Pulley wobbling

I

Loose compressor belt

O

O

O

I

I

Defective clutch/coil

O

O

O

I

I

Suction line plugged

O

O

O

I

O

Suction throttling valve bad

O

O

I

O

Defective expansion valve

O

I

O

O

O

O

Evap. drain hose plugged

I

Broken compressor belt

I

No power to clutch

O

I

Faulty switch/wiring

O

I

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