Most homeowners don’t think about their boiler until it stops heating or fails in the middle of a cold Ontario night. Whether your system is condensing, conventional, or a combination boiler, our certified technicians provide fast diagnostics and same-day boiler repair service. We ensure your system is restored safely, efficiently, and to manufacturer standards.

Why You Should Choose Lambton Heating and Cooling For Your Boiler Repair Needs

When your boiler stops working during a cold Sarnia winter, you need fast, reliable repair service from a company you can trust. At Lambton Heating and Cooling, we’ve been repairing boilers across Sarnia and Lambton County for over 55 years.

Transparent pricing on boiler repairs

Transparent & Upfront Boiler Repair Pricing

We provide upfront, honest pricing with no hidden fees—so you’re never surprised by your boiler repair bill. You will see the cost before the work begins.

Same-Day and 24/7 emergency boiler repair services in Sarnia and Lambton County

Same-Day Boiler Repair Services

We offer same-day boiler repair services across Sarnia and surrounding Lambton County communities. Get back to comfort fast.

Licensed Boiler Technicians who can repair all brands

We Repair All Boiler Brands and Models

No matter what you have, we can fix it. From older units to high-efficiency systems, our technicians have experience repairing every make and model.

Boiler repairs backed by warranty

Boiler Repairs Backed by Warranties

Our work is backed by parts and labour warranties to ensure long-term peace of mind and protection. We stand behind our repairs.

We guarantee customer satisfaction on boiler repairs in Sarnia and Lambton County

Satisfaction Guaranteed on All Boiler Repairs

We care about your comfort. If you’re not completely satisfied, we’ll make it right – no questions asked. Trust the experts with your boiler repair needs.

NEED FAST BOILER REPAIRS?

We provide same-day boiler repair across Sarnia and Lambton County. Whether your boiler is leaking, not heating, short-cycling, or making unusual noises, our certified technicians diagnose the issue quickly and restore safe, efficient performance.

  • Same-day diagnostics & repairs
  • Service for all boiler brands & system types
  • 24/7 emergency no-heat support

Book Service or Request a Quote

Book an Appointment Request a Quote

24/7 Emergency Heating Support

WE REPAIR ALL BOILER BRANDS IN SARNIA AND LAMBTON COUNTY

At Lambton Heating and Cooling, we have the knowledge and training to repair all major hydronic boiler brands. Whether your home has a modern condensing boiler or an older cast-iron system, our licensed technicians have the expertise to repair it.

  • NTI
  • Navien
  • IBC
  • Bosch
  • Rinnai
  • Weil-McLain
  • Viessmann
  • Laars
  • And Many Others

Signs of Boiler Trouble & How We Repair It

Boilers often show subtle warning signs before they fail completely. Recognizing these symptoms early can prevent major repairs and protect your home from heat loss and water damage. Below is a guide to the most common boiler problems — and how our licensed hydronic heating technicians diagnose and repair them across Sarnia and Lambton County.

Leaking or Dripping Boiler

Often caused by failing seals, pump issues, cracked heat exchangers, or pressure problems.

Radiators Not Heating Properly

Usually due to air in the system, pump failures, sludge buildup, or flow restrictions.

Gurgling, Banging, or Whistling Noises

These sounds often indicate trapped air, limescale buildup, low water flow, or failing internal components.

Pressure Loss or Frequent Resetting

Caused by leaks, faulty expansion tanks, pressure relief valve issues, or pump failures.

How Our Boiler Repair Process Works

Boilers require precise diagnostics to ensure safe and reliable operation. Our repair process is designed to identify issues quickly and restore heat as soon as possible.

1. System Diagnosis

We check pressure, pumps, valves, sensors, expansion tanks, heat exchangers, and internal components to pinpoint the exact issue.

2. Transparent Repair Estimate

You receive a clear, itemized estimate outlining the required repairs. No hidden fees — you approve all work before we begin.

3. Perform the Repair

We replace worn components, fix leaks, clear blockages, correct pressure issues, and ensure proper hydronic system operation.

4. Final Performance Testing

We verify water pressure, pump operation, ignition quality, temperature output, and system safety before leaving your home.

Frequently Asked Boiler Repair Questions

Boiler repair costs in Sarnia typically range from $250 to $900+, depending on the issue. Common repairs include pump replacement, ignition failures, leaking valves, pressure problems, and sensor replacements. We diagnose the issue first and provide upfront pricing before any work is completed.
If your boiler is either completely not heating or not producing enough heat to keep your house at the temperature that you have set on the thermostat, there are a few potential causes. The most common causes include thermostat issues, failed pumps, ignition or flame sensor problems, low system pressure, air in the hydronic system, or blocked venting. Our technicians perform a full diagnostic to identify the root cause and restore proper heating.
Banging, whistling, or gurgling sounds often indicate air in the system, mineral buildup, a failing pump, or pressure issues. Noisy boilers should be inspected promptly to prevent component failure or costly breakdowns.
Yes — we provide fast, priority boiler repair across Sarnia, Brights Grove, Corunna, Lambton Shores, Watford, Oil Springs, Point Edward, and the broader Lambton County. If your boiler stops working, loses pressure, leaks, or fails to start, we can dispatch a licensed technician quickly.
Pressure loss is typically caused by leaks in the system, a failing expansion tank, air in the lines, malfunctioning pressure relief valves, or pump issues. We inspect the full hydronic system to determine the cause and prevent recurrence.
Repairs are usually recommended for newer systems or minor issues. Replacement may be a better option if your boiler is 15–20+ years old, needs frequent repairs, has efficiency problems, or requires major components like a heat exchanger. We provide honest recommendations based on cost and long-term reliability.
Leaks may be caused by worn seals, failing pressure relief valves, corroded pipes, faulty pumps, or expansion tank issues. Leaking boilers should be inspected immediately to avoid water damage and system failure.
Boilers should be serviced once per year to prevent breakdowns. Annual maintenance includes cleaning burners, checking combustion levels, inspecting venting, testing safety controls, and verifying system pressure. Regular service dramatically reduces unexpected repair costs.
Homeowners can safely check the thermostat, verify power, inspect the boiler pressure gauge, and ensure vents are unobstructed. Anything involving gas, internal wiring, pumps, or combustion must be handled by a licensed TSSA technician for safety and code compliance.
We repair all major boiler brands, including NTI, Viessmann, Navien, Bosch, Weil-McLain, IBC, Rinnai, and more. Our technicians are trained to diagnose both older systems and modern high-efficiency condensing models.

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