greeny, what does U/S stand for? It means unserviceable does it not? ie not able to be used in service? So, if the heating system is disabled for reasons described above, i'd say it was u/s.
Or do you think it's serviceable but can't be used.???
ATCO, Just listen out for the geordie git in one of the 76's who appears to have no idea what he's doing or saying!!!