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Ok I will order a new MPV valve then. Makes sense as it seems faulty.

I've got TRV valves on all rads. When they are all switched off (set to 0) then the pump shows 32W in the A position. As for B to A I just did that and it is similar behaviour - it goes from 45W to 32 (if all rads' TRVs are on 0 or to about 42W if at least one rad TRV valve is fully open - set...

Ahh I now realised you asked me from to do it from B to A not A to B. I can do that and record the pump readings as well.

So effectively when all rad valves are closed I cannot set the valve to mid position. Is this correct?

@Johntheo5 Here is the video link: https://drive.google.com/file/d/1wFVQ4dqiT312jDfAsa9uO6XygaBFm1EM/view?usp=sharing

@Johntheo5 I removed the actuator again and when I manually move the valve from A to B it shows 32W at the beginning (no radiators calling for heat as all thermostat valves closed on them) and the more I turn it increases to 38W and finally reaches 45W (when it reaches B). What is strange is...

The HW cylinder is super warm though from yesterday's and this mornings heating. Could it be the reason with rads off and valve stuck in mid position the pump is not pumping and the boiler DRY FIREs as no flow?

Does it mean the 3 port valve actuator is gone?

The lever was always loose and floppy in all the tests.

@Johntheo5 So, when you got it "working" by removing/replacing the actuator etc, it still only worked if both HW & CH are both selected and both the roomstat and cylinder stat calling? Not sure it ONLY worked with both HW & CH on but I had to use both at that time and both worked fine...

Hi @gazfen. Thanks for you reply. I have tried that in the past and although there was some air trapped in there it did not solve the problem. I think it is something to do with electrics around the valve as it is showing random results from repeated tests. For instance at the moment it only...

@Madrab Thanks for your advice. You are 100% correct and I am never planning to touch the boiler and anything that needs a pro. I just find it very difficult to sort a relevant person out that has the right knowledge and is not trying to exploit. I live in south Croydon so if there is someone in...

@Johntheo5 I have attached some photos of the piping where it follows the pump inlet (bottom) pipe back. Hope it is more visible what goes where. I've checked the vertical pipe (the manual air vent) and it is not higher than the water level in F&E cistern but not much lower either. Hope that is...

Hi @Johntheo5 As strange as it may sound after my return tonight I tried to switch on the boiler one more time to make sure it is dead by flipping the fuse and the boiler started as normal. I then turned HW only on the programmer and went to the loft to check the pump and it was showing 45W...

Hi @Johntheo5 I think the boiler and the pump have died now. I have started observing DRY FIRE alert again this afternoon and then went upstairs after maybe 30 minutes from noticing and noticed no lights on the pump at all. I went to the boiler and the lights do not come on at all. It looked...

Thank you @DP and everyone else for your help. I appreciate your every comment as I am learning how the system is put together. I will definitely get a heating engineer for an investigation next week. Many thanks again!

Thanks @DP I certainly think there is something acting up in the boiler (PCB/terminals etc as per page 45). Another interesting thing is before going to DRY FIRE the boiler was going to IGNITION LOCKOUT failure about 2 months ago. That was not stopping it from working for HW and CH but I had to...

There was no HW only flow before I took the cover off and manually moved the spindle with power on. I think powering it off and on plus some testing with manual spindle movement looked to at least sort it out temporarily for now.

That's what I suspected was the problem. Today is a 2nd day in a row all is working fine. I hope it continues.

Thanks for your input @Madrab. Can you explain a bit more why S plan would be better to my current Y plan in this instance?