Water heater not working after smart meter installation?

[Rubb3rBiscuit]

Hey Everyone!

I'm hoping someone can potentially point me in the right direction...

I live in an apartment (7th floor), and 6 weeks ago Octopus came out to install a smart meter. We're on an economy7 tariff, but as soon they installed it our water heater stopped working.

We have the typical Off Peak Switch and Boost Switch, off peak always stays on and overnight would heat up.
Based on our reading, we're getting Off Peak rates, it just no longer connects to the Off Peak switch (The light doesn't come on).

Octopus have sent 3 engineers out, and after about 50 emails we've gotten nowhere. Every engineer says the same thing, well it looks right to me.

Here are some images for context. One is our New Smart Meter, the other is what it used to look like (when we were with eon).

I've seen this a lot online, but CANNOT find the solution. Any advice would be massively appreciated.

 

[Wayners]

Water heater is getting power? Any lights on heater to show power?
If not buy a cheap contactless wand and test.
Could be a water heater problem that was a coincidence it failing

 

[Rubb3rBiscuit]

Hey Wayners, Apologies, should have clarified.

Water heater works fine when we use the Boost/Peak function. The switches have LED lights above them to show when they're receiving power. Off Peak doesn't light up anymore, Peak works fine though (just costs a lot more and is very inconvenient).

Images of Switches and Fusebox for reference.

 

[Murdochcat]

If the only thing that uses E7 is your immersion heater then I would Doubt that having E7 makes financial sense

 

[Rubb3rBiscuit]

It was the way the apartment worked when we moved in (and how all the apartments in the block work).

We obviously take advantage of offpeak in other ways (scheduling laundry, appliances etc). The Immersion Heater is the only one though that is 'wired' in to the timings of the off peak (somehow).