Vaillant Boiler: Won't ignite
A Vaillant boiler that clicks or attempts to start but never lights has an ignition-sequence problem — gas delivery, the igniter or flame-sensing electrode, or the fan that must prove airflow before the gas valve opens.
A Vaillant boiler that clicks or attempts to start but never lights has an ignition-sequence problem — gas delivery, the igniter or flame-sensing electrode, or the fan that must prove airflow before the gas valve opens. On Vaillant boilers, this is linked to 4 fault codes (F.28, F.32, F.61, F.62). Below are the likely causes, the safe checks you can make, and exactly what our licensed BC gas technicians do — because boiler repair in British Columbia is licensed gas work, not a DIY job.
This is a gas-safety fault. Diagnosing ignition, flame, gas or venting problems requires combustion analysis and gas-pressure testing that, by BC law, only a licensed gas technician may perform. Never bypass a safety lockout. Smell gas? Leave the building and call 911 or FortisBC at 1-800-663-9911 from outside.
What you might notice
- No heat or no hot water
- Boiler attempts to fire (you may hear clicking) then locks out
- Repeated lockouts after a few ignition attempts
- Ignition lockout or flame failure
- No heat or hot water
- Fault clears briefly then returns
Safe checks you can make first
These are the only steps a homeowner should take. If they don’t resolve it, stop — the rest is licensed gas work.
- 1Verify the gas supply is on and other gas appliances work
- 2Listen for the fan and ignition clicks during the start sequence
- 3Check the display for an ignition or fan fault code
- 4Reset once only; if it fails to light again, call a licensed gas technician
Related Vaillant fault codes
These Vaillant codes are commonly behind “won't ignite”. Tap any code for its full meaning, causes and fix.
What our licensed technicians do
- Verify incoming gas supply and lock-up/working gas pressure with a manometer
- Inspect and clean the igniter and flame-sensing electrode, checking the spark gap
- Test the gas valve operation and ignition control sequence
- Run a full combustion analysis to confirm a safe, clean flame after repair
- Measure static and working gas pressure with a manometer
- Confirm the meter, regulator and gas line are correctly sized
Vaillant won't ignite — FAQ
Why won't my Vaillant boiler ignite?
A Vaillant boiler that clicks or attempts to start but never lights has an ignition-sequence problem — gas delivery, the igniter or flame-sensing electrode, or the fan that must prove airflow before the gas valve opens. The related Vaillant fault codes are F.28, F.32, F.61, F.62. A licensed technician confirms the true root cause with the right instruments before any repair.
Is it safe to keep resetting my Vaillant boiler when it shows "won't ignite"?
No. A single reset after a one-off event is fine, but "won't ignite" involves gas, ignition, flame or venting safety. Repeated resets without fixing the cause can be dangerous and can damage the boiler. If the fault returns, switch the boiler off and call GasBoilers.ca at 604-359-1081. If you ever smell gas, leave the building and call 911 or FortisBC at 1-800-663-9911 from outside.
Can you repair a Vaillant boiler with this problem in Greater Vancouver?
Yes. Our Red Seal–certified, TSBC gas-licensed technicians diagnose and repair Vaillant ecoTEC plus and ecoTEC exclusive condensing boilers & combis across Vancouver, Burnaby, Surrey, Richmond, the Tri-Cities and the rest of Greater Vancouver. Same-day appointments are often available — call 604-359-1081.
“Won't ignite” on other boiler brands
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