Arrived onsite for maintenance for one gas fired boiler. turned the thermostats up to heat and confirmed operation of the boiler and each zone valve. Turned the boiler off and removed and cleaned all burners 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. Completed combustion test. At customer’s request installed 4 digital thermostats. Confirmed proper operation of all thermostats.
