Looks like a dometic/ waeco fridge. Count the pattern of red flashes.
That should give you the fault if you look up your fridge manual online.
How good is the leisure battery as 240v charger often goes straight to leisure battery then fridge runs off battery.
If it’s a 12v fridge (which it looks like it is) then it runs off your leisure battery.
Do you know that your 240v hook up is connected to a battery charger that charges your leisure battery?
Could it be that the LB is low?
You probs need to post a picture of your charger set up and maybe your dc-dc charger so people can give you the correct advice.
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