it was working fine before the fire valve was fitted not new oil

On Saturday, 13 August 2016 22:10:46 UTC+1, TimW wrote:
On 13/08/16 20:20, wrote:
I have had a second fire valve installed in line to protect our boiler since this was installed our aga keeps running too hot and makes strange sounds

don't know about the fire valve, but the Aga bloke told me that fuel oil
is very variable in quality and content. Is it just a new batch in the tank?

TW