HTP Error F11: False Flame Detected
The control senses flame when the boiler is not being told to fire. This is a serious safety lockout (red light, LOCKOUT flashing) indicating a flame-detection or gas valve problem. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The control senses flame when the boiler is not being told to fire. This is a serious safety lockout (red light, LOCKOUT flashing) indicating a flame-detection or gas valve problem.
HTP fault codes can vary by model and series. Use this as a guide — the same code can have more than one cause. Our Technical Safety BC–licensed technicians read the code, confirm it against your unit's manual, and diagnose the true cause before any repair.
Likely causes of HTP error F11
- Gas valve leaking through / not fully closing
- Flame sensor shorted or wet giving a false signal
- Moisture or contamination on the flame rod
- Damaged flame sensor wiring
- Control board fault
What you can safely check
- No safe homeowner internal check; record the F11 code for a technician
- Confirm other gas appliances are operating normally
Beyond these checks, do not open the unit or touch gas/electrical parts — BC law requires a licensed gas fitter. Call us for a proper diagnosis.
Error F11 usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours HTP repair.
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For your safety and to keep your manufacturer warranty valid, BoilerPart.ca does not sell loose boiler parts over the counter or for self-installation. Under BC regulations, gas appliance components must be installed by a licensed gas fitter. Every part we source is genuine OEM and is professionally fitted, tested, and certified by our Technical Safety BC–licensed technicians as part of a complete repair or installation.
Parts often behind HTP error F11
Genuine HTP parts we supply and professionally install — never for DIY.
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HTP Error F11 Repair Across Metro Vancouver
Related HTP Safety & Overheat Codes
Frequently Asked Questions
Fix HTP Error F11 Today
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