Saunier Duval Themis 23 me little hot water
My boiler only produces hot water in 15 second bursts. On calling for hot water the burner lights and will stay lit for 15 seconds, if during this time I shut off the faucet briefly I can get a further 15 seconds. By doing this repeatedly I can get sufficient water to wash / shower. When I have the heating control set to heating and the temperature control set to less than 30 degrees I can get heating in the radiators by interrupting briefly the electricity supply. When the radiator return pipe is warm the heating will run without my intervention providing the temperature control is still at 30. The pointer is set to 9 o'clock. ¿Can anybody help? Regards Geoff Sykes.