barron1992 Posted October 17, 2023 Share Posted October 17, 2023 Hi, I had underfloor heating installed up and down about 2 years ago, been working perfect but at the weekend i noticed when I turned one of the rooms down stairs it would not heat up ! Unless I turned turned a room on upstairs then it would start warming up ! anybody know what I can do to fix this ? Link to comment Share on other sites More sharing options...
JohnMo Posted October 17, 2023 Share Posted October 17, 2023 If you are only trying to heat a single room your heat source may be going into self preservation mode and just switching itself on and off as it isn't able to get rid of the heat it generates quickly enough. Known as short cycling. Issue could be you don't have a radiator always open or don't have system min flow valve, or...? More info required, heat source etc Link to comment Share on other sites More sharing options...
barron1992 Posted October 17, 2023 Author Share Posted October 17, 2023 9 minutes ago, JohnMo said: If you are only trying to heat a single room your heat source may be going into self preservation mode and just switching itself on and off as it isn't able to get rid of the heat it generates quickly enough. Known as short cycling. Issue could be you don't have a radiator always open or don't have system min flow valve, or...? More info required, heat source etc it runs off a boiler with 2 towel radiators in each bathroom. Link to comment Share on other sites More sharing options...
JohnMo Posted October 17, 2023 Share Posted October 17, 2023 If you have zones in every room and the towels rads with RTVs then your boiler will not be able to modulate down far enough to satisfy a couple of floor loops. You need more of the system open to keep the boiler happy. Link to comment Share on other sites More sharing options...
barron1992 Posted October 17, 2023 Author Share Posted October 17, 2023 1 minute ago, JohnMo said: If you have zones in every room and the towels rads with RTVs then your boiler will not be able to modulate down far enough to satisfy a couple of floor loops. You need more of the system open to keep the boiler happy. how do I fix mate ? His it easy ? 19 minutes ago, JohnMo said: If you are only trying to heat a single room your heat source may be going into self preservation mode and just switching itself on and off as it isn't able to get rid of the heat it generates quickly enough. Known as short cycling. Issue could be you don't have a radiator always open or don't have system min flow valve, or...? More info required, heat source etc Link to comment Share on other sites More sharing options...
JohnMo Posted October 17, 2023 Share Posted October 17, 2023 Open your towel rad RTVs to fully open so if there is a call for heat those circuits are open as well. (Assuming they don't have zone valves) If that isn't enough. You need to take one or two of the actuators off the manifold. This will open those loops, all the time. It will not call for heat, but if there is a call for from its thermostat or any other it will open. They are a couple of easy to do cheap fixes to see how it goes. Or just set a couple of thermostat so several room come on. Best solution get rid of some zoning and have a couple of big zones Link to comment Share on other sites More sharing options...
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