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Thanks for your reply. We checked the heating pump and it fine, if it wasn't the upstairs heating would also fail. Also the zone valve - the plumber left this permanently open (also these are new only put in earlier this year) but it made no difference. So out 8 rads downstairs we...

Also the TRV are Temtrol TM M15, is there a direct replacement for these? I'm told these fittings are not the "normal" ones? thanks

Hi, I've just joined this forum hopefuly to get some inspiration... as i am out of ideas. We had a new boiler + megaflow put in earlier this year. everthing worked great, we also had the system flushed out twice before the new boiler was put in. The system was working great this year as...