Dunkirk Error E31: Outlet
The control detects a short circuit on the outlet/supply water temperature sensor. Because the control cannot trust the outlet temperature it enters hard lockout. Display shows 'E31'; manual RESET required after repair. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The control detects a short circuit on the outlet/supply water temperature sensor. Because the control cannot trust the outlet temperature it enters hard lockout. Display shows 'E31'; manual RESET required after repair.
Dunkirk 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 Dunkirk error E31
- Shorted outlet/supply water temperature sensor
- Pinched or chafed sensor wiring shorting out
- Moisture or corrosion in the sensor connector
- Failed control module input
What you can safely check
- No homeowner-safe internal checks - sensor and wiring diagnosis requires a technician
- Note the code so the technician can test the sensor resistance against the chart
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 E31 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 Dunkirk repair.
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Parts often behind Dunkirk error E31
Genuine Dunkirk parts we supply and professionally install — never for DIY.
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Dunkirk Error E31 Repair Across Metro Vancouver
Frequently Asked Questions
Fix Dunkirk Error E31 Today
Licensed Dunkirk diagnosis and repair with genuine parts — same-day and after-hours across Greater Vancouver.
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