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Not sure if it was drained. I just left him to it to do whatever a service entails.

Not sure where I should be looking but…

Photos under the boiler

I have a Vaillant EcoTec pro boiler, 3 years old. I had it serviced today for the first time and since the service, two radiators on the ground floor won’t heat up. Both furthest away from the boiler. One I’m told is a bypass radiator (?). All radiators upstairs (3 bed semi) are still working...