Refrigeration Diagnosis
118
• Suction service valve back seated
• • • • • • • Faulty CIS
• • • • • Faulty HGS
• • Loose or broken electrical connections
• • • • • Sensor out of calibration
• • • • Compound pressure gauge out of calibration
• Leaky receiver tank outlet valve
• • • • • Leaky check valve
•• ••Faulty check valve
• Leaky receiver tank pressure solenoid (RTPS)
• • Closed receiver tank pressure solenoid (RTPS)
• • • • Leaky hot gas solenoid (HGS)
• • Closed hot gas solenoid (HGS)
• • • Leaky liquid line solenoid (LLS)
• • • • • • Closed liquid line solenoid (LLS)
• Leaky liquid return check vale (LRCV)
• • Leaky suction line solenoid (SLS)
• • • Leaky suction line check valve (SLCV)
• • Leaky Zone 2 or 3 hot gas solenoid (HGS2 or 3)
• • • • Closed Zone 2 or 3 hot gas solenoid (HGS2 or 3)
• • Leaky Zone 2 or 3 liquid line solenoid (LLS2 or 3)
• • • Closed Zone 2 or 3 liquid line solenoid (LLS2 or 3)
• Leaky Zone 2 or 3 liquid return check valve
(LRCV2 or 3)
• • Leaky Zone 2 or 3 suction line solenoid (SLS2 or 3)
• • • Leaky Zone 2 or 3 suction line check valve
(SLCV2 or 3)
• • • • Leaky purge valve (PV)
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 a vacuum
Receiver sight glass empty
Suction line frosting back
Unable to pump down system
Unable to pull vacuum in low side
Unable to hold vacuum in low side
Noisy compressor
Unit not refrigerating
Unit not heating or defrosting
Symptom
Possible Causes
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