In article
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JB wrote:
HELP ! I've been in this house now for 1.5 years and have had a
nightmare with this CH system (only 6 years old)
It's a conventional boiler with CH and HW loops, open vented. I have 2
issues that are kind of related really so here we go.

1. When we moved in the first thing I noticed was that the TRVs were
sometimes on the flow and sometimes on the return. Is this wrong, if
so how serious an issue is it for the performance of the system ??? Is
there grounds for quizzing/pushing the installer ???

Some TRVs can be used on either flow or return. Look for an arrow on the
body. If there isn't one it probably means they are ok.

2. 2 of the radiators have been really problematic, kitchen and spare
bedroom. They hardly get warm despite me having many attempts at
correctly balancing the rads. All rads upstairs close to the pump are
turned down almost fully and still heat up really quick.

Sounds like you're guessing this. Lockshield valves ain't linear in
operation. You might find it only needs to be open a quarter turn. Get
yourself a thermometer and measure the in and out temperatures as per the
FAQ on balancing - you have read it carefully?

--
*Pentium wise, pen and paper foolish *

Dave Plowman London SW
To e-mail, change noise into sound.