Vaillant Pro Tec 28

Brickbat22 | 15:19 Sat 19th Aug 2017 | How it Works

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A recent job involved draining the water system, Not the heating system just turning off the main water supply and opening the taps.
After finishing the job I now find that after running the cold tap, as I turn it off, the boiler fires up for about thirty seconds. Any ideas welcomed. Thanks

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