Select a fault code

System pressure below minimum.

Boiler failed to ignite after three attempts.

Flame established but went out during operation.

Communication fault on the eBUS (wiring between boiler and controls).

A fault with the comfort mode (pre-heating) function.

Gas valve not seating correctly — safety lockout.

PCB memory error detected.

Water pressure sensor implausible signal.

No pressure change detected on startup.

No temperature rise detected at startup — possible heat exchanger or pump issue.