I have a fanned balanced flue Ideal gas boiler and Siemens MAV322C 3port motorised valve arrangement.
When HW, CH or both selected boiler fires up but only with a small flame
(it use to roar into life) water not getting hot.
Motorised valve actuator head (motor) had been making a whining noise when CH selected so I have just replaced it. It now no longer makes a noise but I still have same problem of only small flame when HW, CH or both selected.
Any advice would be greatly appreciated as I don't know what else it might be.
___________________________________
moderator
please note 5 in forum rules, you can use your edit button to correct it
When HW, CH or both selected boiler fires up but only with a small flame
(it use to roar into life) water not getting hot.
Motorised valve actuator head (motor) had been making a whining noise when CH selected so I have just replaced it. It now no longer makes a noise but I still have same problem of only small flame when HW, CH or both selected.
Any advice would be greatly appreciated as I don't know what else it might be.
___________________________________
moderator
please note 5 in forum rules, you can use your edit button to correct it