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There are 2 non return valves one in CH direction and one in DHW direction (pump is next in line), turned boiler off, isolated cold mains feed and ran tap, tap stopped. (so I assume its not stuck open!) Also rechecked flow switch by disconnecting, DHW pump carries on running.

Hot water is working fine, keeps water store to correct temperature and burner stops but DHW pump carries on constantly. Therefore no heating.

Hi, its a Grant Vortex Condensing Combi 26 (2006/2007 year) Flow switch checks out fine. Pressure switch checks out fine. Both thermistors checked out fine. Blend valve removed and refitted (hardly any limescale) Since then I found a relay which controls the DHW pump had burn mark around...

Calling all Grant experts please! Just moved to a house with a Grant Vortex Condensing Combi 26 (2006) with full underfloor heating. The plot so far: All was happy until cranking the heating up to 27 degrees, next day no hot water. Figured out if the heating was calling for heat the hot water...