While you wait for answers, we may have found some information which could help you.
Click here for Velaire Oil FiredLow pressure below 1, Lockout on. won't rest?
How can I mend my Hyundai oil filled radiator?
My electric oil heated radiator isn’t heating up properly. ?
Oil filled radiator won’t stop clicking?
Sorry the make is dimplex model FC2009Ti?
Dimplex RMG25 causes circuit breaker to pop?