Diesel Heater Won't Start? Power-Side Troubleshooter
Many diesel heater start failures are really a 12V power problem.
This covers the 12V power side. For fuel, pump and combustion faults, follow the heater's manual or see the installer. Always run the heater with the exhaust outside and a carbon monoxide alarm inside. Work through one question at a time. You can go back or start over whenever you like.
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Safety: this troubleshooter is general information. Follow the maker's manuals. Work on 240V AC wiring, including inverter outputs and mains inlets, must be done by a licensed electrician. Have an auto electrician check high-current DC work if you're unsure.
