Rinnai Error 12: Flame Failure (Loss of Flame)
The unit lit but then lost or could not sense the flame and shut down. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The unit lit but then lost or could not sense the flame and shut down.
Rinnai fault codes can vary slightly 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 Rinnai error 12
- Dirty or failed flame sensor
- Low or fluctuating gas pressure
- Gas valve fault
- Poor grounding
What you can safely check
- Confirm gas supply is steady
- Note whether it lights then drops out within seconds
- Check other gas appliances work 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 12usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours Rinnai repair.
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Parts often behind Rinnai error 12
Genuine Rinnai parts we supply and professionally install — never for DIY.
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Rinnai Error 12 Repair Across Metro Vancouver
Related Rinnai Ignition & Flame Codes
Frequently Asked Questions
Fix Rinnai Error 12 Today
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