A3 317 — Flue gas temperature sensor short circuit

What does A3 317 mean?

There is a short circuit in the contacts of the flue gas temperature sensor. This indicates a fault with the sensor responsible for monitoring flue gas temperatures.

• Short circuit in the flue gas temperature sensor.
• Damaged wiring or connections to the sensor.

Click steps to track your progress.

1. 1

   Power cycle the boiler by turning off the main power supply for at least 30 seconds, then turn it back on.

2. 2

   Visually inspect the flue gas temperature sensor and its connecting wires for any obvious damage.

3. 3

   If the error persists, contact a Gas Safe registered engineer to check and replace the sensor if needed.