Already tried that half do warm don’t go as hot as upstairs and only half warmed up.. maybe 5 of the 12 downstairsTurn the upstairs rads off, then see if the downstairs ones warm up.
All 15mmIs there any microbore going to the downstairs radiators or are they all fed by 15mm pipe?
Ok guys here’s those codes are saying
D.0 37
D.40 71
D.41 63
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