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