First of all I replaced the element in this about a year ago as the old one - looked like the original had gone open circuit, not surprising when I got it out, real corrosion! Anyway all well until this weekend. Worked fine on Friday night, red hot water as usual but on Saturday it was cold? Tried the gas instead and all fine again. When I got home this afternoon I checked it all out. Mains getting to the element and the element shows around 120 ohms so not open circuit. Left it on for a while and I have hot water again? Anyone else know these to simply cut out and then work again?