sime friendly format 80E red light is on no hot water?

i would start by checking that the polarity has not been reversed when the electrical work was undertaken check a socket with a martindale tester if you dont have one use a multimeter with power on live to neutral should give 240 volts live to earth should give 240 volts and neutral to earth should give 0 to 15 volts if this is not the case call your electrician back

tom
June 2007