Fault 14 (Multiple Boilers) - One boiler locks out while others run

What does 14 (multiple boilers) mean?

In a multi-boiler installation, one boiler enters lockout mode with a Fault 14 while others operate normally, suggesting an issue specific to that boiler's gas supply or ignition under high demand.

• Insufficient gas pressure to one boiler when both are running at high fire
• Issue with a specific boiler's gas/ignition system

Click steps to track your progress.

1. 1

   Verify the gas pressure inlet with both boilers running at high fire.

2. 2

   If needed, run relay test #11 to simulate high fire conditions.

3. 3

   Alternatively, run domestic hot water (DHW) production to activate high fire on both boilers.

4. 4

   Refer to general Fault 14 troubleshooting for individual boiler checks.