Outlet Temperature Sensor Fault
Weil-McLain
NTC Temperature Sensor Failure (Outlet)
Control indicates 'Outlet Sensor Error', 'Supply Sensor Fault', or similar; unit may shut down or operate erratically.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted outlet temperature sensor, Damaged sensor wiring harness, Poor sensor contact with piping, Control board input fault
How to Fix / Troubleshooting
Safety first: Turn off power. Piping may be hot; use gloves when touching near the outlet sensor.
- Locate the outlet sensor: Find the NTC sensor strapped or inserted near the hot water outlet or supply header. Note its wiring path back to the control.
- Inspect wiring: Check for loose plugs, broken insulation, or pinched wires. Reseat any plug-in connectors at both the sensor and control board.
- Check sensor mounting: Ensure the sensor is firmly attached to the pipe or properly inserted into its well, with thermal paste if originally provided. Loose sensors can give inaccurate readings.
- Compare resistance (advanced): With power off and wires disconnected, measure sensor resistance with a multimeter and compare to the temperature/resistance chart in the Weil-McLain manual. Replace the sensor if readings are far out of range.
- Replace if faulty: If wiring is intact and the sensor tests bad, install a new OEM outlet temperature sensor and clear any stored fault codes.
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Repair Difficulty
Medium
3/5
Required Part
Outlet Temperature Sensor
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