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yes i have the old servowarm manual valve for dhw/ch, have cleaned boiler and checked for air ,it will start up now and run dhw/ch but i have to put immersion heater on for 15 mins before start up then it works fine .Any ideas please???? could it be the boiler thermostat???? :roll:Its a fully...

Potterton profile about 15 yrs old manual valve for switching from heating to hot water. when switching boiler on with valve set to ch/dhw it fires up for about 5 mins then switches off, pipes to pump are hot ,rads cold!! not a lot of hot water then eventually the over-heat thermostat cuts the...