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Discuss Upstairs radiators only work when HW is on in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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Hi guys,

Weird issue i am having with central heating. I thought it was a pressure issue as rads upstairs were heating intermittently or just getting warm sometimes while rads downstairs are hopping.

I have found that upstairs rads only work when hot water is turned on. Its zoned with a 2 port smart valve on hot water feed to the coil. So i locked level at the rear of valve and now all rads upstairs get really hot. They get warm sometimes with HW off, or just small rads work like ensuite and bathroom.

Im not sure how long its been an issue, as we have hot water on each evening with the bedrooms in use then heating off until morning when we are downstairs.

I know its a weird one hopefully there is an obvious easy fix as i am smashed.

Thanks lads

  • System grant euroflame 70/90 2 years old with new pump.
  • Honeywell evohome with hot water kit(2 port valve) and hr92s on each radiator(13)
 

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