my cbx boiler has stopped changing between c.heating and hot water.there isnt a diaphragm,but an electric motor that moves the valve left for heating and right for hot water.this just stays in one position.
i can disconnect the motor and move the lever manually left and right.then it works fine,so the boiler is ok its just the motor isnt moving.any ideas please?

ridley, January 2013

thanks. it has a turbine in the cold water inlet which is telling the boiler i need water. it then fires up and proceeds to go through the central heating instead of diverting. the motor is plugged into the pcb so i think i may have to bite the bullet and buy a board. thanks

ridster, January 2013

Switch faulty, could of been diaphragm operated switch, but you say no diaphragm, so must be a flow type switch. So look for a unit with some wires going to it on the HW pipe work. No switch operation, no motor operation. System needs to know, that you want HW

SD, January 2013