Any CH experts on here?

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David Brown
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Any CH experts on here?

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?

ncm
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Martin J was kind enough to respond to my boiler question here https://www.lotus7.club/forum/chitchat/ot-domestic-boiler-life

Brian.

Martin J
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Motorized  valves cause a lot of problems. They can become sticky in operation or else the little micro switches can also stick inside. If the switch sticks & because the switch is fed with a permanent live you will get a demand to the boiler & pump when everything is switched off. 

You are correct, the wireless controller is irrelevant. 

The Myson actuators are not brilliant quality, we (British Gas) use our own branded ones but they are made for us by ACL Drayton and again they are not the best Rolleyes It will come down to price no doubt as we must fit thousands. 

By far the best has always been Honeywell, still available & very reliable. You get what you pay for. A bit of a performance to replace all three but sometimes that is the only way to solve problems. 

David Brown
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Thanks Martin, suspicion was raised because it appeared to be the one controlling the hot water that had gone faulty for the third time in four months. Strangely it appeared to “fix” itself after four hours and before I had time to contact the installer. Has worked fine since Monday night. Perhaps the micro switch is sticky but having used many micro switches for years, they are usually pretty reliable, it’s usually the actuation method that leads to problems. 

Will keep an eye on it.