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