Friend I received heater from suggested switch. he could get heater to work sometimes by doing something with exterior switch. opened up heater to see if inside sitch was a problem or if there was some type of a balance shut off that needed something. couldn't observe a problem. it does sound like there is not a lot of oil in this unit but I don't see leaks.

Heating & Cooling - Lakewood - 750 Oil Filled Baseboard Heater