Arrived onsite for maintenance for one gas fired boiler. Homeowner mentioned air in the first floor zone. Requested the customer turn on the thermostats up to heat and confirm 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. Did observe the air sound in the zone. Bled the first floor, second floor zones. Confirmed other zones were okay. The system has an air eliminator which does not seem to be working. Never heard any air escaping sound while purging the zones of air. Confirmed everything is heating properly at this time but concerned about the air eliminator. Note that replacing the air eliminator may require re-piping and/or cutting iron pipe.
