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Thank you for the suggestion. Bacteria setting is disabled. As soon as I put hot water on, my gas boiler starts. I want the nest to use electricity to heat water and gas boiler to central heat the house. I don't know how can I tell it to use different functions for heating and hot water. Below...

Does this pic tell you anything? Everything was working as intended for the past few months so I don't think it's port valve fault but something related to nest settings.

Hello, Please can anyone help with Nest Learning Thermostat setting. We have recently moved in our new house and we have a hanging gas boiler in the kitchen (Potterton) and two blue cylinders in the loft (Telford hot water cooper cylinder - indirect grade 3 and another replacement cylinder)...