While you wait for answers, we may have found some information which could help you.
Click here for Radiator Heating OilLow pressure below 1, Lockout on. won't rest?
My electric oil heated radiator isn’t heating up properly. ?
Oil filled radiator won’t stop clicking?
Fix my oil filled heater?
Glen Dimplex Oil Filled Heater OFC2000 2KW?
What size spanner to free rad bleed valve?