8 — Flue gas temperature has exceeded the monitoring limit

What does 8 mean?

The boiler is in a hold/wait state because its flue gas temperature has exceeded a safe monitoring limit, possibly indicating combustion issues or a blocked flue.

• Faulty flue gas temperature sensor
• Problem with combustion or heat exchange
• Blockage in the flue system

Click steps to track your progress.

1. 1

   Allow the boiler to cool down naturally.

2. 2

   Ensure the flue terminal outside is clear of obstructions.

3. 3

   Contact a qualified heating technician to check the flue gas temperature sensor and inspect the flue system.