My boiler is firing whether the programmer is on or off. There is no stat in the house as far as I can see. The programmer has been replaced, didn't make any difference, the heating is still constantly on.
Having looked at the controls there is a 3 port valve, which then leads into a 2 port valve on the HW side. The heating side of the 3 port Ts off, one way to downstairs but then one way to another 2 port valve on the pipe.
Pretty confused as to what's going on. Sure it's a wiring fault but the electrician won't do anything until I figure out if it's Y plan or S plan, and to me it seems a strange combination of the two. No idea what the two 2 port valves are doing on the system, they seem redundant.
Any help would be great pease!
Having looked at the controls there is a 3 port valve, which then leads into a 2 port valve on the HW side. The heating side of the 3 port Ts off, one way to downstairs but then one way to another 2 port valve on the pipe.
Pretty confused as to what's going on. Sure it's a wiring fault but the electrician won't do anything until I figure out if it's Y plan or S plan, and to me it seems a strange combination of the two. No idea what the two 2 port valves are doing on the system, they seem redundant.
Any help would be great pease!