A. O. Smith Error 31 / 32: Inlet / Outlet Thermistor Failure
A water-temperature thermistor (inlet or outlet) is reading open, shorted, or out of range. Numeric models show 31/311 (outlet) and 32/321 (inlet); alphanumeric models use E06 (inlet) and E07 (outlet). We diagnose and repair it across Greater Vancouver — same-day and after-hours.
A water-temperature thermistor (inlet or outlet) is reading open, shorted, or out of range. Numeric models show 31/311 (outlet) and 32/321 (inlet); alphanumeric models use E06 (inlet) and E07 (outlet).
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 31 / 32
- Failed/aged thermistor (resistance out of spec)
- Scale buildup on the thermistor probe
- Loose or corroded thermistor wiring connector
- Moisture intrusion at the connector
- Damaged sensor harness
What you can safely check
- Power-cycle the unit once to clear a transient fault
- Do not open the cabinet to access sensors
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.
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Parts often behind A. O. Smith error 31 / 32
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A. O. Smith Error 31 / 32 Repair Across Metro Vancouver
Related A. O. Smith Sensors & Temperature Codes
Frequently Asked Questions
Fix A. O. Smith Error 31 / 32 Today
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