E20X
Potterton General Temperature Sensor / NTC Fault

Boiler shows a generic E2x series code related to sensor or temperature faults

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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

Any NTC sensor out of range, Wiring harness damage, Poor sensor contact with pipe, PCB sensor input failure

How to Fix / Troubleshooting

Safety first: Isolate power before testing sensors.

User checks:

  • Reset the boiler once and note when the error reappears (heating vs hot water).

Engineer checks:

  • Identify which NTC (flow, return, DHW) is implicated from the specific E2x code in the service manual.
  • Measure resistance of the suspect sensor and compare with Potterton charts.
  • Inspect wiring and connectors; repair or replace as needed.
  • Replace the faulty NTC sensor; if all sensors test OK, suspect PCB.

Accurate diagnosis requires reference to the specific model's fault code table.

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Repair Difficulty

Medium 3/5

Required Part

NTC Sensor (Model-Specific)
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