Bosch Boiler: Won't ignite
A Bosch 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 Bosch 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 Bosch boilers, this is linked to 3 fault codes (EA, C6, C7). 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
- No heat or hot water
- Boiler will not begin its ignition sequence
- Unusual fan noise or no fan sound at all
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 Bosch fault codes
These Bosch 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
- Test fan power, speed feedback (Hall sensor) and wiring
- Inspect the fan and venturi for debris, dust or seized bearings
Bosch won't ignite — FAQ
Why won't my Bosch boiler ignite?
A Bosch 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 Bosch fault codes are EA, C6, C7. A licensed technician confirms the true root cause with the right instruments before any repair.
Is it safe to keep resetting my Bosch 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 Bosch boiler with this problem in Greater Vancouver?
Yes. Our Red Seal–certified, TSBC gas-licensed technicians diagnose and repair Bosch Greenstar and Singular series 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
Bosch boiler won't ignite? We can help today.
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