I have a little switch next to my hot water fuse in the electricity meter box that clicks on to only heat the water in low tarif time. I think it has been moved and I am not sure what it should be set to. Can someone tell me please? I have. Sun, a moon, 20V, and something else!
Sorry Helen, seems different to ours, which is set on āAutoā, to operate on the cheap rate.
Might be worth posting a photo
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My guess would be it should be where the moon is Helen, If the water is cold in the morning, feel free to blame me 
If you google contacteur-jour-nuit-debflex, the pics show it like this
https://images-na.ssl-images-amazon.com/images/I/51k9AHYTCxL.SL1181.jpg
From top to bottomā¦for a cheap-rate switch it looks like:
Immediate, Automatic, Off (although that is an anglicised version)
Or another language, tells me that it is : (Sun) Daytimeā¦ (Moon) Nightimeā¦ and Offā¦
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I agree with Stella & Bill
Thank you peeps - I have set to A (and the moon). Which of course makes sense. How does it know to operate in just the 8 Tarrif Bleu hours?
If that is the case then I might have to set my overnight house guests on you Bill!
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Thereās a connection from the meter which activates the switch.
This may be entirely wrong - butā¦ I was told by the electricity company that there is a signal sent to people on Tarrif Bleu which switches on the circuit at the correct time.
This came to light as we have a switch similar to the one you have shown but it was not working - the reason was that we were not on the correct tarrif so there was no signal being sent to us to switch it on.
ā¦ they may have however been āpulling my chainā and instead it is actually switched on by golden Unicorns!
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My money is on golden unicorns! But thanks for the heads up.
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On the switch in your pāoto Helen, if you had it set on the āsunā, I guess the heater would be on 24hrs., so the moon is logical to me 
If a bunch of irate folks beat me with cold wet towels tomorrow???
This isnāt the case. The āSunā or āIā (On) position will force the water heater on if you operate it during āheures pleinesā (HP, or full rate) hours. This is to allow you to top up during the day if all your guests take long morning showers.
However, once āheures creusesā (HC, or empty/cheap rate) hours kicks in via the magical golden unicorn switching system the switch in question will flick itself back to Auto/moon & will return to itās usual 8 hours/day operation.
Thatās the long way of saying that moving it to āIā does not leave it on 24/7. If it never moves back to Auto then it (or itās wiring to the meter) is faulty, or you arenāt actually on HP/HC tarif.
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I think thats wott I implied Jonā 
No, what Iāve said isnāt what you implied.
Jonathan, never abbreviated please.
Wonāt bother at all then Jonā
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