18 — Outdoor temperature sensor cable broken

What does 18 mean?

The boiler is operating based on a default outdoor temperature of 32°F (0°C) due to a broken cable connection to the outdoor temperature sensor.

• Broken cable connected to the outdoor temperature sensor
• Loose connection at the outdoor temperature sensor

Click steps to track your progress.

1. 1

   Visually inspect the connecting cable of the outdoor temperature sensor for any breaks, cuts, or loose connections.

2. 2

   Ensure all wiring connections to the outdoor temperature sensor are secure.

3. 3

   If the cable is damaged or the fault persists, contact a qualified heating technician to repair or replace the cable or sensor.