Weil-McLain Flame Loss: Flame Loss During Operation
What the Weil-McLain Flame Loss fault means, what causes it, and why it's a job for a licensed BC gas technician — not a DIY reset.
Severity
High — needs prompt professional attention
Gas safety first
This fault involves gas, combustion or venting. If you smell gas (rotten-egg odour), hear hissing, or feel unwell, leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Do not flip switches or relight anything. For all other cases, switch the boiler off and call a licensed gas technician.
What the Weil-McLain Flame Loss fault means
The flame was lost while firing, triggering a safety lockout.
On Weil-McLain ECO, ECO Tec, Ultra and Evergreen series, Flame Loss is a flame failure. It is a protective response — the boiler is telling you something needs attention, and the safe, lasting fix is a proper diagnosis rather than repeated resets.
Symptoms you may notice
- Boiler fires briefly then shuts down
- Intermittent heat or hot water
- Short-cycling with lockouts
Common causes of Weil-McLain Flame Loss
Why this is not a DIY fix
Loss-of-flame and false-flame faults point to the flame-rectification circuit, a dirty flame sensor, a failing gas valve, or unstable combustion. Confirming the cause needs live flame-current (microamp) readings and combustion analysis — instrumented gas work reserved for licensed technicians.
In British Columbia, gas work must be performed by a TSBC-licensed gas fitter. GasBoilers.ca — a CanroHeat division — sends Red Seal–certified, gas-licensed technicians who diagnose the true cause, repair it correctly, and verify safe operation before they leave.
How our technicians diagnose & repair it
- 1Measure flame-rectification current (microamps) during firing
- 2Clean or replace the flame-sensing electrode and check its ground path
- 3Inspect the burner and heat exchanger for sooting or fouling
- 4Verify gas pressure and re-run combustion analysis
Related Weil-McLain codes
Weil-McLain Flame Loss — FAQ
What does the Weil-McLain Flame Loss fault mean?
The flame was lost while firing, triggering a safety lockout. On Weil-McLain ECO, ECO Tec, Ultra and Evergreen series, this is categorised as a flame failure.
What causes Weil-McLain Flame Loss?
The most common causes are: Dirty flame sensor; Unstable gas pressure; Combustion fault; Grounding. A licensed technician confirms which one applies before any part is replaced.
Can I fix Weil-McLain Flame Loss myself?
No. Loss-of-flame and false-flame faults point to the flame-rectification circuit, a dirty flame sensor, a failing gas valve, or unstable combustion. Confirming the cause needs live flame-current (microamp) readings and combustion analysis — instrumented gas work reserved for licensed technicians. Repeatedly resetting the boiler without fixing the root cause can be unsafe and can cause further damage. Call GasBoilers.ca at 604-359-1081 for a licensed diagnosis.
Is the Weil-McLain Flame Loss fault dangerous?
It can be. This fault involves combustion, gas or venting. If you ever smell gas, leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Otherwise, switch the boiler off and book a licensed technician.
How much does it cost to fix Weil-McLain Flame Loss in Greater Vancouver?
Cost depends on the root cause and any parts needed. We start with a flat-rate diagnostic, then quote the repair before any work begins — no surprises. Call 604-359-1081 for current pricing and same-day availability.
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