Call the bloke back and say can he send you a copy the FGA report.
Say it is required for the manufactures warranty and insurance purposes.
I wnt to a gas boiler the other week. The owner had had the gas valve changed, the pump changed & the PCB changed and the problem still persisted.
Problem - flame sensing probe was touching the burners causing burner to fail after 10 or so seconds.
Not only did I fix the problem, I walked away with a operating gas valve, pump & PCB that were sitting next to the boiler.
He left some real nasty Google reviews on the company that did the install and subsequent repairs - they offered to refund all the money they charged him for repairs if the owner would remove the reviews.
He got his all his money back.
