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Hi cjb1971, Thanks for the reply The pump is being sent 240v all the time, could it be a fault with the pump? why would the pump work to start off with then stop, and then start again approx 5 mins later. Thanks Marc

When CH is put on boiler fires up, pump works, radiators get hot. After approx 5-10 mins ( when the CH return pipe gets hot ) the boiler goes back to pilot, ie waiting for the circulating water temp to drop. After a few mins the pump stops working and then the boiler fires back up, which...