Refrigeration System Diagnosis 14-4
TCI AND SPECTRUM MODELS
Zone heating past septoint
Zone Cooling past setpoint
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 low side
Unable to hold vacuum in low side
Noisy compressor
Unit not refrigerating
Unit not heating or defrosting
SYMPTOM
POSSIBLE CAUSE
• • • Faulty Condenser Inlet Solenoid (CIS)
• • • • • • Faulty hot gas solenoid (HGS)
• • • Leaky check valve
• • • • Faulty check valve
• Leaky receiver tank pressure solenoid (RTPS)
• • Closed receiver tank pressure solenoid (RTPS)
• • • • • Leaky front hot gas solenoid (HGS)
• • Closed front hot gas solenoid (HGS)
• Leaky front liquid line solenoid (LLS)
• • • • Closed front liquid line solenoid (LLS)
• Leaky suction line check valve (SLCV)
• • • Leaky rear hot gas solenoid (RHGS or HGS3)
• • Closed rear hot gas solenoid (RHGS or HGS3)
• Leaky rear liquid line solenoid (RLLS or LLS3)
• • • • Closed rear liquid line solenoid (RLLS or LLS3)
• • • Leaky rear liquid return check valve (RLRCV or LRCV3)
• Leaky front liquid return check valve (FLRCV or LRCV3)
• • Leaky rear suction line solenoid (RSLS or SLS3)
• • Leaky front suction line solenoid (FSLS or SLS3)
• • • • Leaky purge valve (PV)
• Leaky rear suction line check valve (RSLCV or SLCV3)
• Leaky front suction line check valve (FSLCV or SLCV3)
• • • Leaky center hot gas solenoid (CHGS or HGS2)
• • Closed center hot gas solenoid (CHGS or HGS2)
• Leaky center liquid line solenoid (CLLS or LLS2)
• • Closed center liquid line solenoid (CLLS or LLS2)
• Leaky center liquid return check valve (CLRCV or LRCV2)
• • Leaky center suction line solenoid (CSLS or SLS2)
• Leaky center suction line check valve (CSLCV or SLCV2)
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