E16
Baxi Return Temperature Sensor (NTC) Fault

Boiler displays E16, often related to return temperature sensing or differential issues

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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 Baxi return NTC sensor, Loose or corroded NTC connector, Wiring harness damage, PCB sensor input fault

How to Fix / Troubleshooting

Safety first: Turn off power before any internal inspection.

User checks:

  • Power cycle the boiler to clear transient faults.
  • Check that all radiator valves are open and that there is good circulation (radiators heating evenly).

Professional actions:

  • The engineer will test the return NTC resistance, inspect wiring, and replace the sensor if necessary.
  • If the sensor is correct, the PCB may need replacement.
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Repair Difficulty

Medium 3/5

Required Part

Return NTC Temperature Sensor
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