Arrived on site to perform an annual tune up on a Bosch Greenstar. After our initial inspection, we provided an estimate to do the tune up which was accepted. We started by turning power off to the boiler and opened up the heat exchanger. We brushed the inside of the heat exchanger and then blew any debris out. We then inspected the burner cover gaskets. They were good with no signs of dry rotting or cracks. After heat exchanger was cleaned we put it back together and then inspected the igniter electrodes. The electrodes are starting to warp away from each other and the flame sensor was wearing out as well. We recommend replacing the electrodes. There is also a hyvent on the garage zone that should be replaced as well. It is corroding and is not allowing air to escape the system. After everything was put back together we ran the system to verify heat exchanger gaskets sealed properly and to perform a combustion analysis. No CO leaks present and combustion analysis showed the system
