If the box crashed at some point then the fan package may have disabled itself. Anything in the crash.log file?
Posted on the move; please excuse any brevity.
WebIF >> Diagnostics >> View Log Files
If you run the debugtv diagnostic then on the next boot you will start to get a humaxtv.log file which will contain some diagnostic info relating to things like the fan package. I'd also try doing a forced reinstall of fan through the web interface diagnostics screen just to make sure.
Custom firmware now appears to be completely broken. Power cycle HDR Fox T2, can load a small amount of web page and the IE says the connection is lost. This is why I never upgrade this stuff unless there's an actual reason, things always seem to go wrong.
Not teaching you to suck eggs, but have you clicked on the 'Update package list from Internet' button? It is no good just clicking the 'Available' tab without doing so as any new package in the repository will not be listed there until the local list is refreshed. IIRC.
IIRC HDR1 is still on 2.12 and running fan.
Is it an advanced package? Do you have advanced packages turned on in the WebIF settings?