Customer turned the first floor thermostat on. Checked the boiler, did not hear the circulator turn on. Checked for power. Had 127 volts at the aquastat and at the circulator but it’s not turning on. The circulator is bad and needs to be replaced. Customer would like to replace the first floor thermostat also. While working on the circulator, noticed that the extrol tank was full. Recommended replacing while the system is draining. Drained the system and replaced the circulator and extrol tank. Filled the system and purged. Removed the thermostat and installed a Honeywell T4 thermostat. Started and tested.