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