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BINGO! I loosely attached it with a single screw and it works. :giggle: I then attached both screws enough to hold it firm but not any more than needed. Still works. :giggle: All buttoned back up. I will tape a warning note to the electrical box saying blue is live and deal with that later...

What is the point of the actuator manual lever position if, when moving it to manual, it opens the valve but doesn't move the mechanism far enough to reach the microswitch, and therefore the boiler does not turn on?

Sorry, I should have been clearer. The disconnected neutrals are "downstream" of the switch. I mentioned it to ensure that the switch was isolated from anything after it.

;)

With the switch turned on the brown wire is connected to earth, however my multimeter makes a warbling noise rather than a continuous beep, like it is connecting and disconnecting very quickly.

I have disconnected all of the neutrals and the one from the master fused CH switch is the problem. With the neutrals still disconnected I opened up the switch and I have 242V red to black going into the switch then when the switch is on 242V on the blue wire. Note that the brown wire has a...

I haven't gotten as far as swapping the actuators yet, however I have just noticed that regardless of whether the valves are on or off, there is 242V AC on the neutral wrt earth. Oops. If I turn off power to the boiler/digitstat SCR/Centaurplus C27 then it is zero volts, so it isn't a fault in...

OK I understand, my setup is reversed, but here I am just swapping like for like that has worked for years? So I am confused over this. I can see when I look at the actuator that the position of the slot changes, so it should move the valve when connected.

I measured the pink/live wire to earth with my multimeter set to AC. What should it be?

Update: When I said there was no voltage on the pink wire to the CH valve I was expecting there to be voltage when the valve is opened. I now see that it is the other way around - I guess if there is a power cut the failsafe state is to open the valve. So to confirm, I have 242V when value is...

Thanks @Harry Bloomfield - this is a brand new actuator I purchased yesterday. Yes :)

So I can heat my house while I am working on this, which direction should the valve pin be pointing in relation to the valve inlet pipe for it to be open? It looks like closed is 100 degrees clockwise? Thanks.

Thanks @Madrab . Here is an update that might change your answer? I turned the system back on. Valve head is off the valve and cover is off so I can see the motor mechanism. Turning the thermostat up and the receiver green light goes on, I hear a click and the motor turns slowly - takes about...

Central heating is not turning on. Was operating intermittently. No error codes on the boiler. If I remove the cover to the CH motorized valve (Honeywell) and press the microswitch then boiler turns on. So valve is not opening. I replaced the motorized head and no change. With the motorized...

Thanks. I was able to source a Yale replacement.

I have been struggling to solve this for weeks. I hope someone can give me a nudge in the right direction! Circa 2003 slave french door with Mila shootbolts. The top (reverse) shootbolt was heavily corroded but I managed to get it off the door, so now I need to replace it. It cannot be...

Hi, I need to leave my Victorian house empty for three months during winter. The insurance company requires that I keep the temp at a min of 15C, OK so I need to leave the conventional boiler on. I will insulate the boiler condensate pipe and the pipe to the single outside tap. Never had any...

Some idiot in the past extended the hot water to a new utility room. They ran the pipe inside the bathroom waste pipe... this broke pouring water down the drain so the large leak was not visible anywhere. Now fixed.

So to confirm, by closing the DHW outlet valve at the boiler the rads heat up. Open the valve again and the rads cool down. Water pressure has stabilized and held. Any ideas? The installer is reluctantly coming out tomorrow but they are adamant it is not their problem so I need as much...

Sigh.... Viessmann came out and said nothing is wrong with the boiler. The boiler installer says it is nothing to do with them because there is a water leak somewhere in the house. The boiler will only turn the heating on if the DHW is turned off, and vice versa. After I charged the system...