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Yes RL to com. No idea why it suddenly decided to work.

Thanks for your replies, it has decided to work now. Didn't change anything and the fan/pump now turn off when room reaches temp. :roll: Thanks again.

Would connecting it to the programmer connections instead of thermostat connections work ?

Thanks, should have said got live and neutral as well. It looks as though it's wired right then. is it right that the fan and pump run constantly ? other than that it seems to work OK now.

Thanks for your reply. I've got RN RI and RL connections on boiler. connected com on stat to RL and NO on stat RI. should there be a connection to the original time clock ?

It's an RSF. It seems to be firing OK today but the fan and pump are running constantly.

Hi all, hope someone can help. I've just tried to fit a Salus rt500rf to a Worcester 28i boiler. It is switching on but not firing unless I turn a tap on for a few seconds, when I turn the tap off the heating works fine. Any ideas please?