Arrived onsite for maintenance on one high efficiency gas fired boiler. Turn on the thermostats up to heat and confirm operation of the boiler and each zone. Turned the boiler off and removed burner cover plate. cleaned the burner and wiped cleaner the burner compartment. Performed a visual inspection of all electrical and inspected all external water components such as the exp tank, fill valve, backflow preventer and the circulator pump. Cleaned igniter and flame sensor. System working as it should.
