Riello RDB pump problem

[Retiredbuilder]

I found that my oil pump on my RDB1 burner was leaking from a none servicable part
(Drive shaft)
I bought a new pump and fitted it and then got an engineer out to set it up.
He couldn’t set the pressure because as soon as the burner fires up the pressure keeps on rising and doesn’t respond to adjustment before the boiler locks out. After numerous attempts
he suggested refitting the old pump which he could adjust but obviously leaked oil.
I have read from other posts that Riello will want to test the pump before they will issue a refund? I just want to make sure my engineer knows what he’s doing before I return the pump
only to find it is ok?

 

[Retiredbuilder]

I also forgot to mention that the burner was covered in oil with the new pump fitted but not when the old leaking pump is fitted.

 

[oilhead]

When you fitted the new pump did you check the by pass plug? It sounds as though you have a plugged by pass on a single pipe system. Do you have a single or two pipe oil supply?
If you can't answer yourself, I'd suggest getting an engineer who knows what he is doing, although having done half the job yourself, he may not be particularly disposed to investigating further.

 

[Terrywookfit]

As oilhead said check bypass plug is removed for 1 pipe supply.

 

[Retiredbuilder]

Thank you both for your replies. Regarding the bypass screw, these are supplied separate and only need to be fitted when using a two pipe system. It wasn’t the pump at fault as advised by a Oftec registered engineer or the photo cell in the end but a mixture of unburnt fuel and soot blocking up the primary heat exchanger baffles which the engineer did suspect and said he had cleaned. I ended up cleaning them myself and now the boiler fires up.