If it has tripped out, it could be to do with the ambient temperature where the cylinder is stored. If it gets too hot underneath the immersion cap then it will cut out.
If its in an airing cupboard, remove all towels etc, leave the door open to provide ventilation for a day or so and this...
Evening all.
We've got a shower over the bath which we can't use because the water collects around the edge of the bath (see photos) as the installer didn't think. Getting him back to redo the work isn't an option. We've not used it for over 2 years as I keep putting it off but we could do with...