E14
Lochinvar
Stack Flue Sensor Fault
Heater displays E14; may indicate a stack flue sensor or vent temperature sensor open/short.
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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
Failed stack flue sensor, Damaged sensor wiring, Loose connector at control board
How to Fix / Troubleshooting
Safety: Allow the heater to cool and turn off power before servicing.
Steps:
- Locate stack sensor: The stack flue sensor is mounted on or near the flue outlet or exhaust collector.
- Inspect wiring: Check for brittle insulation, rodent damage, or loose connectors. Repair or replace as needed.
- Test sensor: Disconnect the sensor and measure resistance with a multimeter. Compare to the Lochinvar temperature/resistance chart. Replace if readings are open, shorted, or out of range.
- Reinstall and test: Install the new sensor securely, restore power, and verify that E14 clears.
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Repair Difficulty
Medium
3/5
Required Part
Stack Flue Sensor
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