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David LongAug 9, 2025
Why is my Technische Alternative Control Unit displaying incorrect temperatures?
- JJohn KellerAug 9, 2025
If your Technische Alternative Control Unit shows values like -999 (sensor short-circuit) or 999 (interruption), it doesn't automatically indicate a hardware issue. Ensure the correct sensor types (KTY or PT1000) are selected in the menu under SENSOR, as the default setting is PT (1000). To check the sensor, replace the potentially faulty sensor with a known working one on the terminal strip to verify the display.
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