E06
Baxi
Return NTC Sensor Failure
Furnace shows return temperature sensor fault, may short-cycle or lock out
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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
Defective return NTC sensor, Loose or corroded connector, Damaged harness between NTC and PCB, PCB sensor circuit fault
How to Fix / Troubleshooting
Safety: Isolate electrical power before working inside the unit.
- Locate return NTC: Find the NTC on the return pipe entering the Baxi heat exchanger or hydraulic block.
- Inspect and clean: Check for signs of water ingress, corrosion, or loose connection at the sensor plug. Dry and clean if necessary.
- Measure resistance: Use a multimeter to check the NTC resistance at ambient temperature and compare with Baxi specifications. Replace if readings are out of range.
- Check wiring: Trace the cable back to the PCB, ensuring there are no cuts, pinches, or burn marks. Repair or replace the harness if damaged.
Professional help: If wiring and sensor are sound, the PCB may require replacement by a qualified technician.
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Repair Difficulty
Medium
3/5
Required Part
Return NTC Temperature Sensor
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