HVAC & Heating Repair You Can Trust
We Don't Rush to Replace. We Find a Way to Repair.
When your furnace stops firing, your boiler loses heat, or your heat pump blows cold air, you deserve a proper diagnosis — not an instant replacement quote. NexPro repairs and services gas furnaces, gas boilers, heat pumps, and mini-splits for homes and businesses in Newton and Greater Boston.
Ignition, refrigerant, and hydronic testing before any part is changed.
Furnaces • Boilers • Heat Pumps • Mini-Splits
Heating Problems We Diagnose and Repair
You don't need to know which component failed. Tell us what you noticed and we investigate the cause.
Furnace Won't Ignite or Fire
No heat from a gas furnace — igniter failure, flame sensor, pressure switch, or gas valve fault.
Boiler Has No Heat or Uneven Heat
Cold radiators or zones, failed circulator pump, air-locked lines, or stuck zone valve.
Heat Pump Blowing Cold in Heating Mode
Reversing valve stuck, defrost failure, low refrigerant charge, or inverter board fault.
Heating System Short-Cycles
Repeatedly starts and stops — dirty flame sensor, blocked airflow, or limit switch issue.
Error Code on Thermostat or Unit
Locked-out furnace or boiler displaying a fault code that needs diagnostic interpretation.
Loud Noises or Burning Smell
Rumbling, banging, or scorching odors from furnaces and boilers — inspected for safety.
How We Diagnose Heating Equipment
Modern furnaces, boilers, and inverter heat pumps involve electronics and safety circuits. We use calibrated instruments to isolate the real fault instead of swapping parts.
Ignition & Gas Train Testing
Verifying igniter resistance, flame-sensing microamps, gas-valve voltage, and the full ignition sequence on furnaces and boilers.
Inverter & Control Board Diagnostics
Measuring sensor resistances, communication signals, and inverter output to isolate electronic faults in heat pumps and mini-splits.
Refrigerant & Defrost Verification
Connecting manifold gauges to confirm subcooling, superheat, and defrost-cycle operation for heat pumps in heating mode.
Hydronic & Safety Circuit Checks
Testing circulators, zone valves, expansion tanks, and carbon-monoxide safety limits before any repair is authorized.
Diagnostic Fee Policy
A standard diagnostic fee covers the time to inspect, test, and pinpoint the root cause. Before any repair work begins, you receive a plain-language breakdown of the options and a written cost estimate to approve.
Repair or Replace Your Heating System?
An older furnace or boiler doesn't automatically need replacement. A newer one doesn't justify every repair. We explain the tradeoffs.
Repair may make sense when:
- The fault is isolated — igniter, sensor, circulator, or zone valve.
- Replacement parts are readily available.
- The heat exchanger and core components are sound.
- Safe operation can be restored with certainty.
Replacement may make sense when:
- Cracked heat exchanger or repeated major failures.
- Essential parts are phased out or unavailable.
- Multiple core components are deteriorating.
- Repair costs exceed the value of upgrading the system.
Real Heating Repair Stories
Customers across Greater Boston trust NexPro to fix heating systems other contractors tried to replace.
“Danilo from NexPro is exceptional! Our heat pump failed right during a freezing Massachusetts cold snap. Another company told us we had to replace the entire outdoor unit for over $9,000. Danilo arrived same-day, performed thorough electrical and refrigerant diagnostics, and discovered it was only a failed inverter control board and sensor. He sourced the part and had heat blowing within hours. Honest, competent, and saved us thousands!”
“We had inconsistent heating and strange error codes on our gas boiler. The NexPro technician arrived on time, was extremely polite, wore shoe covers, and kept the mechanical room spotless. He diagnosed an ignition control timing issue and flushed the line. Great communication and fair pricing. NexPro will be our go-to HVAC company for all seasonal maintenance.”
“Our furnace stopped firing on a Saturday morning. NexPro actually answered the phone and dispatched a technician within 2 hours. He diagnosed a clogged condensate trap and pressure switch fault, cleaned everything, and tested carbon monoxide safety levels before leaving. Fast, professional, and reasonable diagnostic fee.”
Heating Repair Questions, Answered
My furnace is running but blowing cold air — can it be repaired?
Often, yes. Cold air from a furnace usually points to an igniter failure, a flame sensor issue, a tripped limit switch, or a gas supply problem. NexPro tests the ignition sequence, gas valve operation, and safety circuits to isolate the cause before recommending a fix.
How fast can you get here for a heating breakdown in the Boston area?
We offer same-day and weekend service across Newton, Wellesley, Needham, Weston, Brookline, Waltham, and Watertown. When you call or submit a request, our dispatch desk confirms technician availability and an arrival window.
Is there a diagnostic fee for heating repair?
Yes. A standard diagnostic fee covers the time to inspect, electrically test, and pinpoint the root cause. Before any repair work begins, you receive a plain-language explanation of findings and a written cost estimate to approve.
My heat pump is blowing cold air in heating mode — what's wrong?
Heat pumps in heating mode can lose output from low refrigerant charge, a reversing valve stuck in cooling, an outdoor coil frozen in defrost failure, or an inverter board fault. We verify refrigerant pressures, defrost cycle, and inverter communication signals to find the actual fault.
Should I repair my boiler or replace it?
It depends on the failure and the overall condition. An isolated circulator, zone valve, or ignition control fault in an otherwise sound boiler is typically worth repairing. Repeated failures, a cracked heat exchanger, or unavailable parts may make replacement more practical. We explain the tradeoffs clearly so you can decide.
Do you service both gas furnaces and gas boilers?
Yes. NexPro provides repair and maintenance for gas furnaces and gas boilers, including high-efficiency condensing models. We also service heat pumps and ductless mini-splits in heating mode.
Schedule a Heating Repair Visit
Describe your heating symptoms — furnace, boiler, heat pump, or mini-split. We service Newton, Wellesley, Needham, Weston, Brookline, Waltham, and Watertown.