While you wait for answers, we may have found some information which could help you.
Click here for Hot Hear ThermostatFix my oil filled heater?
Oil filled radiator won’t stop clicking?
What size spanner to free rad bleed valve?
Efficiency of my oil heater?
How can I mend my Hyundai oil filled radiator?
Low pressure below 1, Lockout on. won't rest?