E2 233 — Flow temperature sensor disconnected

What does E2 233 mean?

The flow temperature sensor is disconnected. This prevents the boiler from accurately measuring the water temperature leaving the boiler.

• Loose or disconnected wiring to the flow temperature sensor.
• Damaged sensor cable.
• Defective flow temperature sensor.

Click steps to track your progress.

1. 1

   Reset the boiler by pressing the reset button or cycling the main power.

2. 2

   Visually inspect the flow temperature sensor and its connections to ensure they are securely attached.

3. 3

   If the connection appears fine and the error persists, contact a qualified heating engineer.