While you wait for answers, we may have found some information which could help you.
Success
Message
Fan tries to run every 15 seconds then stops immediately?
Remove cover off gas boiler?
Vaillant F22 fault?
Worcester boiler dripping water?
How do I work my Storad storage heater?
British Gas 532/i Gas Combi Boiler?
Vaillant ecotec 831 plus?
Boiler cycle?
How to fix my fireplace?
Remove boiler cover?
Siemens RDJ10RF thermostat problem?
Worcester Bosch 532/i Combi Boiler?