Quick Answer
AHT plug-in refrigerated display cabinets (Vento, Athen, Macao, Paris) report E-prefixed codes: E00 EEV fault, E02 / E03 / E08 NTC sensor faults, E11 low battery, E12 safety-software fault, E35 / E38 high temperature, E39 defrost run-time, E43 high condensation pressure. Older Dixell-based AHT chest freezers display IS (probe error), D (defrost active), DE (defrost end).
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What error codes does AHT Cooling Systems display?
EEV fault on Vento / Athen / Macao — inspect stepper-motor wiring and ohm out the four EEV coils against AHT spec
Suction gas temperature sensor fault — reseat connector, then ohm the NTC against the AHT R-vs-T curve
Air intake sensor fault — same NTC diagnostic flow as E02 on the air-inlet probe
Pressure-tube (discharge gas) temperature sensor fault — check sensor clamp position on the hot-gas line
Low battery on control board (RTC backup) — follow AHT IOM Chapter 10.2.3 battery replacement procedure
Class B safety software fault — single power cycle only; if it returns, control-board service required
Goods room temperature above high-temp alarm threshold — condenser, ambient, night blind, refrigerant charge
Control temperature too high — same diagnostic family as E35 with the control sensor as primary input
Defrost run-time fault — ohm out defrost heater, check termination sensor, inspect for chronic icing
Condensation pressure too high — clean condenser, verify fan and ambient before suspecting overcharge
Common questions about AHT Cooling Systems equipment
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