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(Have been on holiday therefore the delay) We got a plumber out last week and he tried a few things. Both elements seem fine as they both heat up the water and he also tested with a power meter. But they only work when the cables to the Horstmann are swapped around. When the cables are normal...

That is the strange thing, I thought the tank was drained but I don't think I was right there. Maybe the burning was the heater burning and the tank was full? We don't have a tester, but will get one tomorrow and try it out. I guess the best thing to do is to test the immersion heater...

Hi guys, We live in a flat and have an electric immersion boiler with a Horstmann Electronic 7 controller. It is not heating during the off-peak period. The light for off-peak comes on however. Manual boost function works fine, we get hot water from that and you can hear the boiler...