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These resources will teach you how to diagnose and fix any boiler: signup.advancedboilertraining...
This is a walkthrough on how to wire a Hive V3 Thermostat on a Vaillant EcoTec Pro.
Tools used in this video:
Nws multi cutters: amzn.to/3XosG6n
Knipex ergostrip: amzn.to/3jLl4NP
Voltage tester screwdriver: amzn.to/3HXHeEF