Help Chinese diesel heater

The Chinese ones claim they have a thermostat, and when the hab area reaches a certain temperature, the heater does slow down.
The proof of them having a genuine stat ...is being able to shut down fully when set temp is reached and restart when temp falls ....
VERY few are able to do that out of the box
 
So we are trying to fit one as a temp measure till we get to Spain.
It’s all fitted but keeps coming up with code 8 !!!
Any one please it’s bleeding cold.
🥶
Could it be dip tube has a pinhole or does not reach the fuel......
 
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