Dear friends.Please give me advice on my stupid question. How to troubleshoot toilet fans?

The Ecs fans have been discontinued as they went bust.

The fans as jfm says are junk.

I did find one that fit on eBay with a light in that works well. My bathroom has 2 fans. One is shallow fit and this fan won't fit. The deeper fit on does fit.

I will try and find a link but it was some years ago.
 
On mine, the little plastic window over the photo electic cell had gone all milky and crazed.
Threw it away and bought a new fan.
 
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