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Robert NorrisSep 6, 2025
What causes a short circuit in the return sensor of a Vaillant ECOTEC PLUS VU 80?
- KKathleen RodriguezSep 7, 2025
If the Vaillant Boiler shows a short circuit with the return sensor, possible causes are: * The sensor plug has a short to the casing. * There is a short-circuit in the cable harness. * The sensor is faulty. Inspect sensor connections and wiring to address this.