2005 Almera heater issue but different

Hi all.

I have a 2005 1.8 Almera with the digital stereo/ heater system

Recently its taken to only blowing hot air at the max 32degrees setting.

If you changed it to 31.5 or below it just blows out cold air.

Has anyone seen this issue as all my searches throw other heater problems but not this one.
 
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