Refrigeration System Diagnosis 14-3
NOTE: *Unit would be able to ramp down if the unit had the BPCV valve front seated
• • • • Liquid refrigerant entering compressor
• • • Restricted line on the low side
• • • • Restricted line on the high side
• • • • Restricted dehydrator
• Evaporator damper open
• • • Evaporator damper stuck closed
• Discharge service valve back seated
• Suction service valve back seated
• • • • • • • • Faulty three-way valve
• • • • Faulty pilot solenoid
• • • • • Controller or sensor out of calibration
Leaky receiver tank outlet valve
• • • *Leaky bypass check valve
• Leaky condenser check valve
Faulty three-way condenser pressure bypass check valve
• • • • • Modulation or ETV valve stuck closed
• • • • • Hot gas bypass valve stuck open or leaking
ALL MODELS EXCEPT TCI AND SPECTRUM (Continued)
Unit operating with reduced heating capacity/DF
Unit Operating with reduced refrigeration capacity
Rapid cycling between Cool and Heat
Unit cools in Heat and Defrost cycle
Unit heats in Refrigeration cycle
High head pressure
Low head pressure
No head pressure
High suction pressure
Low suction pressure
No suction pressure
Unit operating in vacuum
Receiver sight glass empty
Suction line frosting back
Unable to pump down system
Unable to pull vacuum in compressor
Unable to hold vacuum in compressor
Noisy compressor
Unit not refrigerating
Unit not heating or defrosting
SYMPTOM
POSSIBLE CAUSE
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