Diamond Home Services logo
Diamond Home ServicesServing Toronto & the GTA
24 HOUR RESPONSE GUARANTEED

Gas Fireplace Repair in Thornlea, Markham

Fast, careful gas fireplace repair in Thornlea, Markham.

Call (437) 475-2233
24 hour response
Licensed & insured
OEM parts on the truck

When a gas fireplace stops behaving — pilot won't stay lit, flames look wrong, glass is fogging, or the unit smells odd — you want a real diagnosis, not a guessed part swap. Our repair technicians in Thornlea, Markham arrive with common OEM components already on the truck, run a full combustion diagnostic, and quote the fix before touching a screw.

Why gas fireplace repair matters in Thornlea, Markham

Safety Comes First

A misbehaving gas appliance is not something to leave alone. Every call starts with a gas leak and CO check before diagnosis.

Real Diagnosis

We don't guess. Multimeters, manometers, and combustion analysers tell us what's actually wrong before we replace anything.

OEM Parts

Where the manufacturer still supports the unit, we use factory parts — never universal parts that void your warranty.

Our gas fireplace repair process

  1. 1

    Safety Check

    Leak detection, CO reading, and a visual inspection of the venting system come first.

  2. 2

    Component Test

    Ignition module, valves, thermocouple, thermopile, and blower are all tested electrically and mechanically.

  3. 3

    Quote Before Repair

    You get an itemised quote covering parts and labour before we start the actual repair.

  4. 4

    Fix And Verify

    We complete the repair, then run the unit through full cycles and re-check combustion.

  5. 5

    Warranty

    Every repair in Thornlea, Markham carries a written labour warranty and full parts coverage.

Common findings in Thornlea, Markham

  • Failed thermocouples — usually the culprit when the pilot won't stay lit
  • Corroded ignition modules from years of humidity
  • Blown thermopiles causing intermittent shutoffs
  • Blocked fan or blower assemblies

What you get

One Trip, Most Times

Common parts on the truck mean we finish the fix on the first visit for most repairs.

Written Warranty

You leave the call with paperwork covering the parts and the workmanship.

Straight Answers

If a unit isn't worth repairing, we say so. No pressure, no scare tactics.

Gas Fireplace Repair reviews in Thornlea, Markham

4.9 average from 743 verified customer reviews
Honest advice on sizing
I wanted a bigger unit. They explained why it would overheat the room and recommended a smaller model — and were right.
Ravi S. - Markham - 2026-01-19
Solid work, arrived late once
One late arrival due to traffic, but they called ahead. The installation quality itself was excellent and the flame calibration is perfect.
Katherine L. - Ajax - 2026-01-06
Wood to gas conversion
Liner, gas line, and a sealed insert. The room is genuinely warm now instead of drafty. Permit and inspection handled without me lifting a finger.
Marcus B. - Mississauga - 2025-12-04
Fixed a bad previous install
Another company left the vent termination too close to a window. Diamond re-routed it to code and documented the correction.
Stefan G. - Richmond Hill - 2026-03-16

FAQ

How long does a repair take?

Most single-fault repairs take 60–120 minutes on site.

What if the part is discontinued?

We'll tell you before we start and help you weigh repair vs. replacement.

Do you charge for the diagnosis?

There's a flat service fee that's credited toward the repair when you proceed.

Book your gas fireplace repair today

24 HOUR RESPONSE GUARANTEED — call now to lock in a slot in Thornlea, Markham.

Call (437) 475-2233

More Markham services

Related pages

Gas Fireplace Repair in other Markham neighborhoods