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Fed the immersion with a separate power lead as suggested and that proved that the heating element was working OK. My brother-in-law tested the link with his volt meter and found that the white wire (the one upper left on the photo) while looking OK had sheared from the connector. The cover to...

Sorry - slow on the uptake!

... forgot to say... the boost is the separate heating element at the top of the tank. That is on a separate switch and is working OK. Interesting... perhaps I could rewire the power that goes to the boost element (that's known to be working) and wire it to the economy 7 (it will reach) and...

That's just going outside my comfort of home electronics. If I start dabbling I can see me being a blackened crisp. My brother-in-law's got a multi meter, I'll speak to him to progress the testing. Really appreciate your advice on this, it's been a great help. Thanks Karl. Vic

That's going in from the power switch

All seems be controlled from here and the thermostat...

... just on & off Sorry - having trouble post a photo of the mains set up...

Meter and thermost Having trouble posting image!

The only user user control is the thermostat.

Does this have to be after midnight when the Economy 7 kicks in?

It's been working OK for two years then I decided to lower the thermostat setting ever so slightly (just received the electricity bill!) at it didn't work that evening. The cause/effect is obvious, too much of a coincidence to be anything else, but what could be 'broken' just by adjusting...