E08
Baxi
Outlet Temperature Sensor Fault / DHW NTC Error
Unit shows E08 and stops; may occur when hot water demand is high or during long draws.
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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
Faulty domestic hot water (DHW) NTC sensor on Baxi plate heat exchanger, Loose or corroded sensor connector, Sensor not in proper contact with pipe or plate, Wiring fault to control PCB
How to Fix / Troubleshooting
Safety: Isolate power before removing covers.
Steps:
- Locate DHW NTC: Find the sensor attached to the domestic hot water outlet pipe or plate heat exchanger on the Baxi unit.
- Check connection: Reseat the plug on the sensor and on the PCB. Look for moisture or corrosion.
- Inspect mounting: Ensure the sensor is firmly clipped or screwed in place with good thermal contact. Replace any missing clips or thermal paste as specified.
- Test sensor (if equipped): Use a multimeter to check resistance and compare with Baxi’s chart.
Professional: Persistent E08 usually requires sensor replacement or PCB diagnostics by a technician.
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Repair Difficulty
Medium
3/5
Required Part
DHW Temperature Sensor (NTC)
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