recently the boiler has started the noise as in the videos. No idea where to start from. The boiler is used rarely, but for a while the top up valves where open which meant the pressure was always high when the boiler was on, this was fixed but the has started a while after the valve was turned off. The boiler has not been serviced for 2 years (new house owner and recently found out they need servicing) Any advise what this could be how much will it cost to be fixed? Thanks
link to videos of attached don’t work:Boiler noise - https://1drv.ms/f/s!AmmqVO9_YrbH7QP65zYResJaZDsB
link to videos of attached don’t work:Boiler noise - https://1drv.ms/f/s!AmmqVO9_YrbH7QP65zYResJaZDsB