Knowledge base

Vaillant fault codes

aroTHERM • flexoTHERM

Vaillant AroTHERM / FlexoTHERM fault codes F.22, F.28, F.281, F.028 and F.022 covering pressure, hydraulic flow and electronic communication faults. Step-by-step AskMarcel diagnostics for professional installers.

Vaillant fault code F.28: causes, diagnosis and solution

Fault code F.28 indicates a burner ignition failure after five initial attempts, causing the appliance to enter fault mode. This fault is also displayed if the problem persists after three manual reset attempts.

Available brands: Atlantic, Daikin, Gree, Hitachi, Mitsubishi Electric, Panasonic, Samsung, Toshiba, Vaillant, Viessmann