Guided Diagnostics
Pick a symptom and answer a few questions. Each flow walks you to the most likely root cause and the fix.
Case Not Holding Temperature
Walk through a display case or walk-in running above product temperature.
High Head / Discharge Pressure
Diagnose a rack running high discharge pressure or tripping high-pressure safeties.
Compressor Won't Start
A compressor is commanded on but is not running.
Compressor Short Cycling
A rack compressor starts and stops rapidly.
Low Suction Pressure
The suction group runs below setpoint and compressors can't satisfy.
Oil Failure / Low Oil
Diagnose oil-safety trips and low oil on the parallel rack.
CO2 High-Side / Gas Cooler Pressure
Transcritical CO2 rack running high-side pressure above the optimum target.
CO2 Flash Tank / Receiver Pressure
Intermediate receiver pressure off target, upsetting liquid feed and MT suction.
CO2 Standstill Pressure Rising
System off and pressure climbing toward relief — protect the charge.
CO2 Rack Inefficient in Hot Weather
High-side pressure and energy look high on a hot day — is it normal transcritical operation or a fault?
CO2 Gas Detection Alarm
The store or plant-room CO2 detector is alarming — handle it as a safety event first.
R-290 Self-Contained Case Not Cooling
Diagnose a plug-in / self-contained display case on R-290 (propane) that isn't holding temperature — safety first, then airflow, electrical, and sealed system.
R-290 Case Condenser Fan Not Running
Diagnose a self-contained R-290 (propane) case where the condenser fan has stopped or slowed, driving up head pressure and warming the case.
R-290 Case Controller / Config Fault
Walk a self-contained R-290 case that's off temperature or alarming when the sealed system and fans check out — setpoint, probe, and defrost configuration.