Underfloor Heating Slowly Heating on 2 Zones Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[Stavros4113]

My grunfos pump connected to my underfloor heating system has power coming from the heatmiser control panel and the 5 zones are heating but 2 more slowly than the others have now noticed that the green indicator lights on the pump are not showing my question can the underfloor heating work without the pump running