Error 20 - Central Heating NTC sensor Fault

What does 20 mean?

This error code indicates a problem with the Central Heating NTC (Negative Temperature Coefficient) sensor. The boiler's display will show the spanner symbol and the numeric error code, suggesting a sensor malfunction.

• Faulty Central Heating NTC sensor
• Damaged wiring to the sensor
• Loose sensor connection or calibration issue

Click steps to track your progress.

1. 1

   Press the 'R' (reset) button firmly for several seconds to attempt to clear the fault.

2. 2

   If the error persists, turn off the boiler's electrical supply at the isolation switch for 30 seconds, then turn it back on.

3. 3

   If the fault code reappears, contact your installer or the Baxi service division ('heateam') for assistance.