Boiler repair in Chelmsford, MA
A boiler heats water that circulates through baseboards, radiators or radiant loops. When it fails, the house cools and pipes can freeze. Our emergency boiler repair service in Chelmsford is open 24/7. We handle hot-water boiler faults, circulator pumps, expansion tanks, leaks and pressure problems.
If the boiler is leaking, shut off its fuel and power and call. If you smell gas or oil fumes or hear an alarm, leave the house and call the gas utility or 911 first. If you have no heat, check the thermostat, the breaker and the boiler's reset, then call.
We explain what we find in plain terms. A circulator pump is a small repair. A cracked heat exchanger is not.
No heat in winter: what is an emergency
No heat when it is freezing outside is urgent, especially with young children, older adults or medical needs. A leaking boiler or a carbon monoxide alarm is more urgent.
Common boiler problems
| Symptom | Likely cause | Typical fix |
|---|---|---|
| No heat, boiler off | Ignition, control or safety lockout | Diagnose and reset or replace part |
| Radiators cold | Air in system or failed circulator | Bleed, replace pump |
| Banging or kettling | Scale or low water flow | Flush, check pump |
| Pressure drops | Leak or failed expansion tank | Find leak, replace tank |
| Water at base | Leak at fitting or tank | Repair or replace |
Repair or replace
Boilers can last decades, but parts wear. A repair is usually right when the boiler is sound and the part is minor. A heat exchanger crack, repeated failures or an inefficient old unit may point to replacement. Related hot water and installation work is on our water heater installation page.
Venting, combustion safety and fuel supply fall under gas fitting and oil burner rules, and we tell you when a specialist license applies.
Boiler leaking or no heat?
Call now.
Maintenance that prevents midwinter failures
- Annual service before the heating season.
- Bleed radiators and check pressure.
- Check the expansion tank and relief valve.
- Test the circulator and zone valves.
- Keep carbon monoxide alarms working.
What boiler repair costs
Sudden boiler leaks that cause water damage may be covered, but wear and tear is not. For your number, call (855) 575-2890.
What to tell dispatch when your heat is out
A few details let us send the right plumber with the right parts. Tell us the fuel the boiler burns, whether it is a hot water or steam system, roughly how old the boiler is and what you see on the control display. A photo of the model plate is even better if you can send it later.
- Whether the boiler is running, cycling on and off or completely dead.
- Whether any radiators are warm and others cold.
- The reading on the pressure gauge, if there is one.
- Any water on the floor around the boiler.
- Whether anyone in the house is elderly, very young or ill, because that changes the urgency.
If you smell gas or oil fumes, leave the house and call 911 before you call us. Heating problems are urgent in winter, but fuel odors are a safety issue first.
Keeping a boiler out of the emergency column
- Schedule a yearly tune-up before the first cold week, not during it.
- Keep the area around the boiler clear of boxes and stored items.
- Know where the fuel shutoff and the water feed valve are.
- Bleed air from radiators at the start of the season if yours need it.
- Replace a leaking pressure relief valve or expansion tank early.
A boiler that gets a yearly look rarely fails without warning. The tune-up checks combustion, pressure, controls and safety devices, and it is much cheaper than a midnight call in January.
Serving Chelmsford and nearby
We repair boilers across Chelmsford and in Westford, Lowell and Billerica. Frozen pipes after a heating failure are covered on our burst pipe repair page.
Heating equipment is serviced according to the manufacturer's instructions and the state plumbing code, 248 CMR, and fuel-side work must be done by a licensed professional.
Boiler Repair questions from Chelmsford homeowners
Yes. The line is open 24/7. No heat in cold weather is dispatched as an emergency.
Air in the system, a failed circulator or a closed valve.
Shut off fuel and power and call.
Annually, before winter.
Call and tell us the fuel. We confirm what we can service.
Yes, after a repair-or-replace conversation.
Heat back on.
Call the 24/7 line in Chelmsford.