Combi Boilers Maintenance
Keep Your Combi Boiler Running Safely and Efficiently with Markham Heating & Air Conditioning
Your combi boiler supplies both heat and hot water for your home, so keeping it in top condition matters. Regular professional maintenance improves efficiency, lowers energy bills, and helps prevent unexpected breakdowns. At Markham Heating & Air Conditioning, our certified technicians provide thorough combi boiler maintenance designed for Ontario’s long, cold winters.
Combi Boiler Maintenance Services
Let Markham Heating & Air Conditioning Keep Your Heat and Hot Water Reliable All Year Round
Annual Combi Boiler Servicing
Our certified technicians clean, inspect, and adjust every major component so your combi boiler delivers steady heat and endless hot water.
Lower Bills, Fewer Breakdowns
A well-maintained combi boiler uses less fuel, heats water faster, and lasts longer, saving you money and preventing costly emergency repairs.
Dependable Local Support
As a reliable local company, we provide honest recommendations, transparent pricing, and maintenance plans that keep your system worry-free.
Call us, or send us an email for a free estimate
Our Maintenance Promise
We take pride in delivering thorough, hassle-free combi boiler maintenance from start to finish. Our technicians follow a detailed checklist to catch small problems early, restore peak efficiency, and keep your system safe and reliable through every Canadian winter.
Full Component Inspection
We inspect the burner, heat exchanger, pump, valves, and controls to catch small issues before they turn into costly repairs.
Cleaning & Flushing
We clean the burner and heat exchanger and flush the system to remove buildup, restoring efficiency and steady hot water flow.
Pressure & Safety Testing
We test system pressure, gas connections, venting, and carbon monoxide levels to make sure your combi boiler runs safely.
Performance Report & Advice
We walk you through our findings, answer your questions, and give honest recommendations to keep your system running its best.
Is Your Combi Boiler Acting Up? Run Through This Checklist First
Before calling a technician, take a few minutes to check these items — it could save you the cost of a service call.
- Is the thermostat set correctly? Confirm the thermostat is set to Heat and the temperature is above the current room temperature. Also, check that the hot water temperature setting hasn’t been accidentally lowered.
- Is there an error code on the display? Most combi boilers display a fault code when something is wrong. Take a photo of the code and have it ready when you call — it helps us diagnose faster.
- Has the circuit breaker tripped? Combi boilers run on a dedicated circuit. Check your panel and confirm the breaker is fully on.
- Is the gas supply on? Confirm the gas shutoff valve near the unit is open (handle parallel to the pipe = open). If other gas appliances in your home aren’t working either, contact Enbridge Gas at 1-866-763-5427.
- Is the condensate drain clear? High-efficiency combi boilers produce condensate. A blocked or frozen drain line can trigger a system lockout. Check that the drain line isn’t kinked or obstructed.
- Is the system pressure correct? Check the pressure gauge on the unit — most combi boilers operate between 1 and 1.5 bar when cold. Low pressure can prevent the system from firing. Do not attempt to re-pressurize unless you’re familiar with the process.
If you’ve worked through this list and your combi boiler still isn’t operating properly, give us a call. Markham Heating and Air Conditioning is ready to help — we service all major brands.
Combi Boiler Maintenance & Tune-Up
A combi boiler tune-up is preventative maintenance designed to keep your system delivering reliable heat and on-demand hot water — before small issues become expensive repairs. Regular servicing extends equipment life, helps maintain warranty requirements, and ensures your boiler operates safely and efficiently all year.
When you book a tune-up with Markham Heating and Air Conditioning, a fully licensed technician will perform a thorough inspection of your combi boiler. We service all major combi boiler brands.
Here are a few items covered in our inspection:
| Inspection Item | Why It Matters |
|---|---|
| Thermostat & controls check | Confirms the system responds correctly to heating and hot water calls |
| Gas pressure check & adjustment | Proper gas pressure is critical for safe and efficient combustion |
| Condensate drain inspection | A blocked drain can cause a system lockout — checked and cleared as needed |
| Heat exchanger inspection | Checks for scale buildup or damage that reduces efficiency and heating output |
| Burner & ignition check | Ensures reliable ignition and clean combustion on every firing |
| Flue & venting inspection | Confirms exhaust gases are safely venting outside the home |
| System pressure check | Verifies operating pressure is within the manufacturer's specified range |
A full written report of our findings is available on request after every tune-up, so you always know exactly where your combi boiler stands.
Why it matters
Regular tune-ups help catch worn parts before they fail, keep your system running efficiently, and protect against safety risks. Staying current with annual maintenance can also be a requirement for keeping your equipment warranty valid.
Ready to book your combi boiler tune-up?
Our Brands
Navien
High-Performance Combi Boilers — NCB-H and NFC-H Series