A. O. Smith Error 9 Flashes: High Temperature Limit Fault
The high-temperature limit (ECO) sensed water/jacket temperature above the safe threshold and locked out the burner. The heating LED flashes 9 times. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The high-temperature limit (ECO) sensed water/jacket temperature above the safe threshold and locked out the burner. The heating LED flashes 9 times.
A. O. Smith 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 A. O. Smith error 9 Flashes
- Failed or miscalibrated gas control thermostat
- Sediment buildup causing localized overheating
- High-limit/ECO sensor tripped or failed
- Stuck gas valve overheating the tank
- Thermostat set too high
What you can safely check
- Turn the gas control/thermostat to OFF
- Carefully test a hot tap — extremely hot water indicates an overheat condition
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 9 Flashes 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 A. O. Smith repair.
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Parts often behind A. O. Smith error 9 Flashes
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A. O. Smith Error 9 Flashes Repair Across Metro Vancouver
Related A. O. Smith Safety & Overheat Codes
Frequently Asked Questions
Fix A. O. Smith Error 9 Flashes Today
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