F.24 — Water shortage, rapid temperature rise

What does F.24 mean?

The boiler has detected a water shortage condition, indicated by the temperature rising too quickly. This typically points to poor circulation or air in the system.

• Pump blocked or insufficient pump output.
• Air in appliance.
• Water pressure too low.

Click steps to track your progress.

1. 1

   Check the system pressure on your boiler's gauge. If it's low, refill the system to the recommended pressure.

2. 2

   Vent radiators to release any trapped air from the system.

3. 3

   If the problem persists, contact a qualified service technician to inspect the pump and system circulation.