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Looks like ill have to leave it to the experts as the boiler cover is part of the combustion chamber and needs to be tested after removal / replacement. Not a DIY job as i thought. Thanks again.

Hi thanks for the info ill have another look at it tomorrow and see if one has been fitted , I wouldnt have thought so because the boiler has been installed in a bedroom cupboard. Ill let you know how i get on, once again thanks for your help.

Im not sure its in a friends house and i have only checked Ls Ns and Lr and dont know where or how to check the remote frost stat can you advise me on this. You could be right as if it was internal to the boiler Lr would become live when activated creating the scenerio i have now. Thanks for...

If i'm right the RX1 should apply 240v to Lr when heating is required. It should not be on the back plate when the RX1 has been removed.

yes that's exactly right , i have removed the RX! from the wall leaving just the back plate with the wiring connections and Lr has a mains voltage on it , which i why i think i have a boiler fault (short circuit on the boiler pcb )

Hi thanks for the reply its a Greenstar 24i Junior. It is conected to a Danfoss RX1 and a wireless connection to a TP5000 RF Si. The problem i,m having is that the boiler wont turn off, its been fitted for years and working great until recently. It does not have a hard wired thermostat so...

Hi all Im having a problem with my boiler as i cant turn the heating off (unless i turn the dial to frost mode). I have removed the RX1 from the back plate and i have 240v on Ns and Ls and i also have 240v on Lr which if i'm right should be 0v and only 240v when the RX1 sends the 240v to the...