E2 — CH water flow NTC sensor defective

What does E2 mean?

The central heating (CH) water flow negative thermistor coefficient (NTC) sensor or its connection leads are defective. This sensor monitors the temperature of water flowing out for heating.

• Defective CH flow NTC sensor.
• Damaged or loose connecting leads to the sensor.

Click steps to track your progress.

1. 1

   Check the wiring connections to the central heating flow NTC sensor for tightness.

2. 2

   Inspect the sensor leads for any signs of damage or corrosion.

3. 3

   Reset the boiler by pressing the reset button, or power cycle it at the mains.

4. 4

   If the problem continues, contact a Gas Safe registered engineer.