Check all your connections to and from your heater, the module , the thermistor, and the pressure switch. If you can, test the heater for continuity with a meter, then you can get a more accurate diagnosis. Remove the connections to the heater to do this and check to be sure the power is off and unplugged. A F08 error is either the Heater control or a NTC (Thermistor) temperature sensor problem
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