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- 6 Dec 2016
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Conventional gravity fed system with 3 port valve and HW cylinder stat - unless the cylinder stat is triggered, the CH pump will not run. Consequently, HW temp has to be up much higher than I would like, in order to heat the radiators. System is Danfoss AT tankstat and Danfoss programmer, and a Sunvic 2701 valve. This has been the way it operates for years, and it's about time it was sorted - is it more likely to be an original wiring error or a fault in the 3 port valve Sunvic head (which I don't recall ever replacing over the last 17 years)? I did change the valve body last year however. In summer months with CH off, I can have HW set at lower temp, and all works fine without the CH. Grateful for any advice or insight.