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I have bought a few TRVs to install, however, there seems to be a few issues:- 1) C/H pipe - The 15mm to 10mm adapter that comes with the valve will require cutting back the existing olive and possibly jointing a new piece of 10mm pipe on - should I just cut it back put a 15mm to 10mm...

Here is the problem:- 1) If programmer put to H/W only, I get H/W and C/H on full blast 2) If programmer put to C/H only I get nothing at all (boiler&pump are off) 3) Room Thermostat doesn't seem to control rad temps - always on full blast 4)Mid point valve always in mix position I have...