hotpoint ff175 and similar fridge freezers?

not a question more of a guide

re the above hotpoint

a client asked me to look at one recently which had stopped chilling in the fridge section though the freezer seemed to be fine.

on investigation i found that these have a weird and completely lame system of having a heat exchanger in the freezer section with a fan and some ducting to blow cold air up into the fridge compartment.. the temperature being controlled by a probe attached to a swinging gate over the duct...

the problem was an iced up heat exchanger and probe in the bottom section which led the unit to believe everything was cool..

de-frosted it and it is running fine, but what a rubbish design !!