What does True E1 mean?

The LAE electronic controller on your True TSCI-series scientific refrigerator has detected a fault on the T1 thermostat probe. T1 is the gray return-air NTC thermistor that drives compressor cut-in and cut-out.

What does True E3 mean?

The LAE electronic controller on your True TSCI-series scientific refrigerator has detected a fault on the T3 multifunction probe. T3 is an optional yellow NTC thermistor used as a secondary measurement point — on TSCI scientific units it typically monitors a glycol bottle or a secondary zone.

Refrigeration

True error codes, decoded.

Look up any True fault code below. Each one is grounded in True's own service documentation — the meaning, the symptoms, the causes, and the steps to clear it.

By Octavian Ghindea

Co-founder & CTO · Reviewed August 2026

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True sits in our Refrigeration coverage. Every page here is transcribed from the manufacturer's manuals, not scraped from forums.

What error codes does True display?

Tap a code for the full breakdown — meaning, symptoms, causes, and fix steps.

Probe T1 Failure - E2: Probe T2 Failure - E3: Probe T3 Failure - thi: Maximum Pr

Probe T3 Failure 23 Instant Probe Temperature (Glycol bottle measured temperatur

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Common questions about True equipment

Other Refrigeration brands we cover

AskWhiz documents error codes for these manufacturers in the same vertical:

3M Accurex AHT Cooling Systems AKO Alco Controls Alfa Laval Arneg Aspera BAC Bitzer Bock Carel