If the taps run hot but the radiators stay cold, the boiler itself is working. That narrows it down, and it's often something you can check in five minutes.
If your boiler stopped on a freezing morning and it's gurgling or showing a fault, the small plastic pipe outside is usually to blame. You can often sort it yourself with warm water and a reset.
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No hot water is one of the most common calls we get, and the cause is often something you can check yourself. Work through these checks first. If none of them sorts it, we can send an engineer.