While you wait for answers, we may have found some information which could help you.
Click here for Boiler Rads Cold HelpFix my oil filled heater?
Oil filled radiator won’t stop clicking?
Sorry the make is dimplex model FC2009Ti?
What size spanner to free rad bleed valve?
Glen Dimplex Oil Filled Heater OFC2000 2KW?
Where can I get a manual for my ritetemp oil heater ?