On an oil system, a technician usually starts with fuel delivery, the nozzle and filter, ignition, and the flame sensor. On a gas boiler or furnace, the focus shifts to the igniter, flame sensing, the pressure switch, and venting. Either way, expect a test of carbon monoxide levels and draft before the system goes back into service.
If the repair turns into a replacement, the job needs a permit. Holbrook takes gas, plumbing, electrical, and sheet metal applications online through PermitPro, and the Building Department at Town Hall is open Monday through Thursday and closed on Fridays. Ask the contractor how they handle permit timing if the failure happens late in the week.
More than half of Holbrook's housing was built before 1960, and heating equipment in houses that age may be squeezed into tight basements or closets. Clear a path to the equipment, the oil tank, and the electrical panel before the technician arrives.