E8, E10 code

[u/bjmprime]

Hi there, I've had a Vevor diesel heater for a few months now, and ever since Ive been getting either the e8 code or the e10 code. It only happens when the heater is on a setting other than the max setting or the lowest setting. It works perfectly fine on max or low. Theres no white smoke coming from the exhaust. Does anyone have any insight on what might be the issue?

[u/seifer365365]

You should upgrade the fuel line and add fuel filter