Tile Crack - Advice Needed

[Thoughts]

I hope that someone can help advise me! I had my bathroom completely refitted in November, including underfloor heating and floor tiles. It is beautiful. Yesterday I noticed a small crack in one of the tiles. I have attached two photographs. What I really want to know is what has caused this? Could it be that I had the underfloor heating on too high a heat? Could someone have dropped something on it? Or is it more likely to be something more serious, and I should expect more to appear? I don't know if you can tell this from a photograph but I thought it was worth asking in case! I'm really worried, particularly as the bathroom was done so recently and I was so happy with it! Many thanks in advance!

 

[Flintstone]

It could be a number of things, my advice would be to keep an eye on it if it spreads or any more crack.

 

[Spare Tool]

From the pic it looks like its following a substrate line and not bending off as if someone had dropped something...How was your ufh commissioned and whats the makeup of the subfloor from base to tiles?

 

[Time's Ran Out]

Bet he tiled straight onto plywood?

 

[Spare Tool]

Bet he tiled straight onto plywood?

🙁 looks an expensive tile too 🙁

 

[J Sid]

don't like to say this 😡 but i agree with timeless 🙄

 

[White Room]

Looks almost like a fault in the tile....

 

[Thoughts]

Thanks so much for all your replies! Much appreciated. I am afraid I am stereotypically clueless! I attach photos of the stages of the work with the hope that might answer some of the questions. I had never heard of commissioning ufh but have just looked it up. I completely didn't follow this at all as I didn't know about it! 🙁 Could this have caused it? If it did, will it continue to get worse? It's possible the crack has been there a while without me noticing it.

 

[One Day]

As above - looks like a glaze fault. Probably only just noticed it. Doubt very much it's a crack

 

[Thoughts]

The thought of it being a fault in the tile re-assures me greatly - that would mean it would be unlikely to occur elsewhere right?