Weil-McLain Error E37: Return Temperature Sensor Open
The return water temperature sensor circuit reads as open (broken), so the control loses return-temperature data and locks out. Some service manuals also reference E13/E14 for related sensor faults. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The return water temperature sensor circuit reads as open (broken), so the control loses return-temperature data and locks out. Some service manuals also reference E13/E14 for related sensor faults.
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 E37
- Failed or open return temperature sensor (thermistor)
- Disconnected or broken sensor wire
- Corroded sensor connector
- Sensor not seated in its well
- Control board input fault
What you can safely check
- Power-cycle the boiler and see if the fault persists
- Confirm the boiler area is dry and connectors are not visibly damaged
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 E37 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 E37
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Weil-McLain Error E37 Repair Across Metro Vancouver
Related Weil-McLain Sensors & Temperature Codes
Frequently Asked Questions
Fix Weil-McLain Error E37 Today
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