No hot water in electric shower

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I’ve got a triton cara 8.5 kw shower that’s stopped providing hot water. It has a power supply and cables are well connected.

I notice that there is no continuity between the screws I have circled in yellow. Is this likely to be the issue?
 

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I’ve got a triton cara 8.5 kw shower that’s stopped providing hot water. It has a power supply and cables are well connected.

I notice that there is no continuity between the screws I have circled in yellow. Is this likely to be the issue?
Is it providing cold water. If not you need to rectify that before replacing the cut out
 
Yes cold water regardless of where the shower dial is. If it’s turned to hot, the pressured reduces ( like it did when. It worked) but the water is still cold. Does it still point to thermal cut out?
 
Just bear in mind that with an Electric shower (and a lot of appliances too) it costs proportionally more to buy individual parts than to but the whole appliance itself and then the cost/trouble of replacing them.
Not so much with a thermal cut out I know but with heating elements etc it is rarely worthwhile.

From the picture it looks like the thermal cut out might be on the Line side of things but bear in mind that a manufacturer might put them on the N side of things and some manufacturers do not put them so they cut out all of elements of the usual 2 or 3 elements but sometimes just one or two so when it trips to off it merely reduces the heat rather than cutting it off completely.
 

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