That sounds like a boiler fault, so I think you need the services of an RGI. From the Worcester Greenstar Ri manual:
But there still appears to be something wrong with the heating control though as well, if you can try the floppy lever test and make the link to the white wire I might be able to advise further on that. The good news is that the hot water controls seem OK.
But there still appears to be something wrong with the heating control though as well, if you can try the floppy lever test and make the link to the white wire I might be able to advise further on that. The good news is that the hot water controls seem OK.