Gas Boiler Repair in Boston
Gas boiler won't ignite, showing an error code, or short-cycling? Call (617) 691-5446 to be connected with an independent local heating company that works on gas-fired boilers in Boston and Suffolk County.
Service overview
What gas boiler repair involves
A gas boiler needs gas, a spark or pilot, airflow and a safety control that proves the flame. When one of those fails, it locks out. Older atmospheric boilers use a standing pilot and thermocouple; newer high-efficiency (condensing) boilers use electronic ignition, a flame sensor, an inducer or blower fan and a pressure switch, and show error codes on a display. Combi boilers, common in condos and smaller apartments, heat the home and the tap water from one wall-hung unit, so a fault can mean no heat, no hot water, or both. Repair means reading the code or tracing the fault, then replacing the failed part: an igniter, flame sensor, gas valve, pressure switch, control board or blocked condensate drain. Gas work in Massachusetts has to be done by a licensed plumber or gas fitter. If you smell gas, leave the building and call your gas utility or 911 from outside. For other problems, see boiler repair in Boston.
! Common warning signs
Ignition clicks but no flame
Repeated clicking with no flame usually means the gas isn't reaching the burner or the flame sensor isn't proving the flame. Don't keep resetting it; call.
Error code on the display
Write the code down before you call. It tells the technician where to start: ignition, airflow, water pressure or the condensate drain.
Short-cycling on and off
A boiler that fires for a minute and shuts off wastes gas and wears parts. Common causes include an oversized boiler, a dirty flame sensor, low water flow or a thermostat problem.
Scope of work
What a gas boiler repair visit usually includes
A typical visit covers a safety check, a diagnosis, the repair and a combustion test. Ask the company to price anything extra first.
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01
Safety check
The technician checks for gas leaks, carbon monoxide and proper venting before working on the boiler.
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02
Ignition and flame proving
The igniter, pilot or thermocouple, flame sensor and gas valve are tested to find why the boiler won't light or stay lit.
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03
Airflow and venting
On high-efficiency boilers, the inducer fan, pressure switch, vent pipes and condensate trap are checked, since a blockage stops the boiler firing.
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04
Combustion test
Ask for a combustion test after the repair to confirm the boiler is burning cleanly and venting safely.
Why call a licensed pro
Gas leaks and carbon monoxide are real risks. Massachusetts requires a licensed plumber or gas fitter for gas work.
Call nowTools a gas boiler technician uses
Combustion analyzer
Measures oxygen, carbon monoxide and flue temperature to confirm the gas boiler is burning and venting safely.
Multimeter
Tests igniters, flame sensors, pressure switches and control boards to pinpoint the failed part.
Manometer
Measures gas pressure at the valve and the draft or pressure in the venting, to confirm the boiler is getting the gas and air it needs.
Gas leak detector
Checks fittings and the gas valve for leaks before and after the repair.
Local service
Boston has a mix of older atmospheric gas boilers in basements and newer condensing boilers that vent through the side wall in PVC. Condensing boilers can lock out when the condensate line freezes on a very cold night. Massachusetts law requires carbon monoxide alarms in homes with fuel-burning equipment, so check yours work. If the boiler is old and failing often, compare a repair with a new boiler.
Gas boiler repair in Boston
- • Downtown Boston
- • Dorchester
- • Jamaica Plain
- • South Boston
Example jobs
Gas boiler emergencies
If you smell gas, leave first
If you smell gas or your carbon monoxide alarm sounds, leave the building and call 911 or your gas utility from outside. For no heat with no gas smell, call (617) 691-5446 to be connected with a local company that works on gas boilers.
How gas boiler repair works
Call and describe
Tell the company the boiler brand, any error code on the display, and whether it clicks, lights then shuts off, or does nothing.
Safety check and diagnosis
The technician checks for gas leaks and CO, then tests ignition, airflow and controls to find the fault.
Repair and combustion test
They quote the repair, replace the failed part and test combustion. Ask for the quote in writing first.
What gas boiler repair costs in Boston
It depends on the part. A flame sensor or igniter is usually a smaller job than a gas valve, inducer fan or control board, and after-hours calls often cost more. We don't set prices; the company you're connected with quotes the work.
The failed part
Sensors and igniters cost less than gas valves, fans or control boards.
Boiler type
Parts for high-efficiency condensing boilers can cost more and may need to be ordered.
Time of the call
Night and weekend calls usually cost more than a scheduled weekday visit.
Gas boiler repair questions, answered
What should I do if I smell gas near my boiler?
Leave the building right away, without using switches or phones inside, and call 911 or your gas utility from outside. Don't try to find the leak or relight anything.
Why does my gas boiler keep locking out?
Common causes include a dirty flame sensor, a failed igniter, a blocked vent or condensate drain, low water pressure, or a gas supply problem. Note any error code and call.
Who can repair a gas boiler in Massachusetts?
Gas piping and gas appliance work in Massachusetts must be done by a licensed plumber or gas fitter. Ask the company you're connected with for their license.
Do I need a carbon monoxide alarm?
Massachusetts law requires carbon monoxide alarms in homes with fossil-fuel-burning equipment, including gas boilers. Test them regularly and replace them as the manufacturer recommends.
Why does my combi boiler have heat but no hot water?
A combi switches between heating and hot water with a diverter valve, and heats tap water through a small plate heat exchanger. A stuck diverter valve, a scaled heat exchanger, a faulty flow sensor or low water pressure are common causes. Note any error code and call (617) 691-5446.
Can a combi boiler be repaired, or does it need replacing?
Most combi faults are repairable parts such as a diverter valve, sensor, fan or pump. Replacement usually comes up only when the main heat exchanger fails on an older unit. Ask the technician to compare the repair price with a replacement quote.