In May we got a new Ideal Logic+ boiler fitted and it was controlled by three Myson Actuators, downstairs and upstairs heating and hot water cylinder. Almost immediately after installation the hot water actuator failed by switching the boiler on, with no demand therefore the valve remained closed. Thus the boiler was running with no demand. The installer replaced the actuator with another Myson that failed in the same way after 24hours. He replaced the “faulty” new Myson with a Hortsmann Z22w which has worked perfectly until today. All are controlled by a Drayton Wiser wireless but I think that is irrelevant.
Any expert have any suggestions why three actuators should fail?