1. Power. If the nor’easter took your power, your boiler is not broken — oil burners, circulators, and controls all need electricity. Check the panel for a tripped breaker too; storm surges trip breakers, and a boiler on a tripped circuit looks exactly like a dead boiler. The fix is the grid or the generator, not a service call.
2. Thermostat. Dead batteries and storm-related setting changes cause a real share of “no heat” calls. Confirm it is set to heat and calling for heat before anything else.
3. The oil tank gauge — if you burn oil. If the gauge reads empty or the needle sits below the red, say so on the call — it changes the dispatch from “broken burner” to “needs fuel, then a bleed and restart.”
4. Snow on the vent and intake. Drifts bury direct-vent terminations and condensate drains on outside walls. A blocked vent trips safeties and locks the unit out — clear snow gently from around the pipes (never force anything) and see if the unit recovers.
5. The reset button — once. On oil, one press of the red reset is the limit. Repeated resets flood the chamber with unburned fuel and turn a no-heat call into a soot cleanup. On gas, one reset; if it locks out again, the safety chain is telling you something — call.