Oil boiler not firing up

[benjamin31]

Hello,
Did some work today on an oil heating system. Fitted two rads in a bungalow. On filling the system back up some of the rads took a while to fill, so I put heating on to get the pump running. All the rads now bled fine, and system filled ok.

However, the boiler doesn't seem to fire up when there is a call for heat. The pump runs, and there is power to the boiler, but it doen't fire.

It's a Grant oil boiler, on a pumped Y plan, 7 rads, and it's only about a two year old system.

Any ideas?

Cheers.

 

[kevplumb]

did you lock the 3 port mid position while filling

 

[benjamin31]

No.

 

[kevplumb]

No.

oops

 

[benjamin31]

What's your diagnosis kevplumb?

 

[kevplumb]

there is poss still air in there somewhere

 

[benjamin31]

Would that stop the boiler from firing?

 

[oilman]

No. A blocked nozzle would though.

 

[gasandoilman]

does the motor on the boiler start?

sounds like the overheat stat tripped if lack of water did you try reset its under the black plastic cap