Arrived onsite for maintenance and purge of 2 baseboard zones. 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. Found the aquastat relay was not functioning. It’s not turning on the circulator nor is it going off at temperature. Purged both zones of air and confirmed all radiators and baseboard is heating. Recommended repairs: aquastat, fast fill valve, back flow preventer, pressure relief valve.
