A building with no heat in January is an emergency, and this is not an argument for delaying the call. But there are four things worth checking in the two minutes it takes to find your phone, because one of them fixes it outright often enough to be worth knowing, and the others make the visit shorter.
Start with the thermostat, and specifically with whether it has power and what it is actually set to. A dead battery in a thermostat presents exactly like a dead boiler: nothing happens, no noise, no heat. So does a thermostat that somebody knocked into a scheduled setback, or off. It sounds too simple to be worth mentioning, and it is a real share of the no-heat calls that come in.
Then check the obvious isolators. Heating systems usually have a service switch near the unit, and it looks exactly like a light switch, which is why they get flipped by people looking for the basement light. Check the breaker for the boiler or furnace too. If a breaker has tripped, you can reset it once — but if it trips again immediately, stop. That is an electrical fault asking for attention, not a switch that needs holding down.
Third, look for a reset button and a fault light. Many boilers and furnaces lock out after a failed ignition attempt and sit there with a light blinking a pattern that means something specific. Pressing reset once is reasonable. Pressing it repeatedly is not: each attempt sends gas to a burner that has already failed to light it, and the lockout exists precisely to stop that. If it locks out again, note the blink pattern — it tells whoever comes out roughly where to look.
Fourth, if you have a boiler, look at the pressure gauge. Most run around one bar cold, and a system that has dropped to zero has lost water somewhere and will not fire. That is a leak to be found, not a gauge to be ignored.
Two things that are not diagnostics but matter more than any of the above. If you smell gas, do not touch a switch or a reset button: leave the building, then call the gas emergency line from outside, then call us. And if the building is going to sit cold for hours in a freeze, think about pipes — a burst pipe turns a heating repair into a much larger bill.
Everything else is genuinely a job for someone with gauges and a meter. Cold radiators upstairs with a warm basement is circulation, not a dead boiler. Short-cycling, blowing cold, tripping a limit switch, or a furnace that lights and then gives up after thirty seconds are all specific faults with specific causes. That is what the 24-hour line is for, and it is a real line — not a voicemail that gets picked up on Monday.
Talk to Xpress HVAC
Tell us what the system is doing. We will tell you plainly what it needs — and if it has failed right now, we are open.