>> Son had a similar issue 6 months ago. HW but no heat in radiators.
>>>> It was the small cold water tank being empty - the float had stuck - filled with water and all was well.
>>
Autumn a few years ago , time to start using the CH and I too had no heat in the radiators.
Called in a plumber and... sucks teeth....I can see it is an old system etc. They do not last for ever. Suggest new properly insulated HW cylinder and a new boiler. The fact that " I have a few brochures in my car....
Thought some more about it. Inspected the header tank, waggled the ball valve and the tank refilled and all was well.
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