Had a call from a customer saying the heatings on even with programmer and roomstat off and they’re getting no hot water and it’s a Worcester Bosch 30si combi boiler.
Attend to find when you run a hot water tap, the boiler fires and stays lit however it’s only cold water from the tap but the rads are getting hot.
Check this video out to see how I located and diagnosed the fault.
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![](https://i.ytimg.com/vi/3zhyY8IIKwY/maxresdefault.jpg)