Weil-McLain Error E31: Outlet Temperature Sensor Shorted
The outlet (supply) water temperature sensor reads as a short circuit, so the control cannot trust the supply temperature and locks out for safety. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The outlet (supply) water temperature sensor reads as a short circuit, so the control cannot trust the supply temperature and locks out for safety.
Weil-McLain 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 Weil-McLain error E31
- Failed/shorted outlet temperature sensor (thermistor)
- Damaged or pinched sensor wiring
- Moisture in the sensor connector
- Sensor connector shorted
- Control board input fault
What you can safely check
- Power-cycle the boiler and note whether the same sensor fault returns
- Confirm no water is dripping onto wiring near the boiler
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 Weil-McLain repair.
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Parts often behind Weil-McLain error E31
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Weil-McLain Error E31 Repair Across Metro Vancouver
Related Weil-McLain Sensors & Temperature Codes
Frequently Asked Questions
Fix Weil-McLain Error E31 Today
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