Select a fault code

System pressure has dropped below the minimum operating level.

Boiler failed to ignite after multiple attempts.

Flame extinguished unexpectedly during operation.

Gas valve not closing properly — safety lockout.

PCB memory error detected.

Pressure sensor reading is implausible.

No pressure change detected at pump start-up — pump or sensor fault.

Condensate pipe blocked or frozen.

No temperature rise detected on startup.