S.54 — Water shortage (temperature gradient), operation blocked

What does S.54 mean?

The boiler has detected a water shortage, indicated by a rapid temperature rise (temperature gradient). This has activated a waiting period, blocking the boiler's operation.

• Too little water in the appliance.
• Blocked pump.
• Insufficient pump output or air in the heating system.

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 in the heating system.

3. 3

   If the problem recurs, contact a qualified service technician to inspect the pump and ensure proper circulation.