While you wait for answers, we may have found some information which could help you.
Click here for Baxi Ch ModeEfficiency of my oil heater?
Where can I get a manual for my ritetemp oil heater ?
What size spanner to free rad bleed valve?
Dimplex RMG25 causes circuit breaker to pop?
Sorry the make is dimplex model FC2009Ti?
Low pressure below 1, Lockout on. won't rest?