Worcester cut out

3 Aug 2006
Reaction score
United Kingdom
Hi I have a worcester boiler that just cuts out, looked on the cover of the boiler and it says its the 'overheat Thermostat' has triggered and to reset it you need to remove the boiler casing to reset the thermostat by pressing a red button on the front panel,
When you have reset the boiler and you open the hot tap the pressure increases from 1.25 bar to over 3 bar in the space of 10 mins.

What could be cause of this??

Cheers :(
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Hello thanks for the diagnosis...

How would I sort of sort the expansion vessel out if suppose it was not faulty but flat as you say?

Thanks again
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