I went to my parent's home for holidays and I left my phal watered. I took the rest as they need to be watered every 2-3 days.

When I came back I found this:



It's so sad for me, I don't get along very well with Phals and this was the first leaf I got from it (despite them being easy plants, I find other sorts of orchids easier).

I watered it with Physan-20 and I came back to my parent's. I return home on Friday.

I don't know what sort of problem is this, but here's a wild guess: Heating stopped functioning. Maybe I left it watered + cold = fungus?
I checked the crown for rot. I don't have a pic. It does not look rotten but it doesn't look good either, there's something dry there. I'll take a pic when I come back.


Help?