Technische Alternative ESR21-R User Manual (English)

Questions and Answers:

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Randy PottsAug 9, 2025
Why is my Technische Alternative ESR21-R displaying incorrect temperatures?
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  Ryan WallAug 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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Brenda MillerAug 19, 2025
What to do if my Technische Alternative Control Unit system is not in operation?
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  Drew LevineAug 19, 2025
  If your Technische Alternative Control Unit isn't working despite having power, check the 3.15A quick-blowing fuse that protects the control system and the output. Replace the fuse if necessary.
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Christopher NixonAug 28, 2025
How to troubleshoot a malfunctioning Technische Alternative ESR21-R with realistic temperature values?
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  Jordan HernandezAug 28, 2025
  If your Technische Alternative Control Unit is malfunctioning but displaying plausible temperatures, consider these checks: * Verify the program number. * Examine the switch-on and switch-off thresholds and the set differential temperatures to see if they've been reached. * Check if settings in the submenus have been altered. * Test the output in manual mode to ensure it can be switched on and off. If it responds correctly during an endurance run, the unit is likely in order. * Confirm that all sensors are connected to the correct terminals. You can test a sensor by heating it with a lighter and observing the display.