Recent content by chillyfly

I sure do! At least it's working properly before the chap installs Hive...

Didn't mean to confuse by talking about the roomstat. I was trying to find the break in the HW off signal. The other wire in the same piece of electrical flex at the junction box was wired to the roomstat, so I suspected I might find the other end of the black wire there too. Another black wire...

Good news! I followed the black wire in the junction box by the valve along the twin core cable back to the roomstat downstairs. (The signal from the roomstat was coming in on the same cable) and lo and behold, after removing the front of the roomstat and unscrewing it from the wall box, there...

Hi All. Well, I have established there is indeed a 240vAC signal on a pin 1 under the following conditions:- Both HW and CH off, and CH only on. Under other conditions (CH + HW, HW) the voltage on pin 1 drops to zero. So it's either a break in continuity or the wrong wire. As the British Gas...

Brilliant thanks. Brain wasn't working - I was trying to work out how I can test the continuity of the wire without having the world's longest multimeter leads. I will try your method next week and report back...

Thanks for that! I think this line explains it clearly to me:- "If HW is now satisfied or turned off, 240v is applied to the grey wire, via either the programmer HW OFF or HW stat SAT terminal (top right), This applies 240v to the motor via switch S1. This is sufficient to move the motor from...

Right, well, thanks to your helps I have found the following:- There is indeed a wire connected to pin 1 on the clock. (See the photo of the Hortsmann Centaur clock backplate below) It is black in colour and disappears into the wall conduit. However, when I trace it up to the junction box in...

I checked the PDF manual I found online and it is indeed a single screw and tilt up to remove. I also now understand the function of pin 1. It seems to mimic the function of the cylinder Stat, sending a signal to the valve to close as if a SAT signal was sent from the cylinder Stat. I suppose...

Thanks very much all. The clock is a long way from the valve and pump, on a different floor. The present installation is not set up as a gravity system (which is an option), so I guess either there is a fault like the microswitch, or it was not installed correctly in the first place and hasn't...

The other thing I should have mentioned before, the valve has a cryptic message on the label that says "valve used for hot water only" But why would you have a three way valve with A and B going to the CH circuit and the HW tank if it was only for HW!? Confused slightly by that. It's a fairly...

OK thanks. I had to go ahead and order a valve head as most of the threads I searched also suggested a duff microswitch. So I'll try that first when it turns up tomorrow. Regarding the Hive receiver - showing my ignorance, but wouldn't that need to be next to the valve anyway? I am assuming...

Ok thanks, I'll do that first. It's not too expensive. Fortunately it's the type that can be replaced dry...

Thanks. The fact that the motor moves the valve to the correct position but the pump doesn't start and the boiler doesn't fire up - is that pointing more to a wiring fault? Is the boiler and pump commanded on by the valve reaching the correct position and not by the signal from the controller...

Hi All Long time since I've been back to these forums and I have looked around for the answers but as yet with no luck. I have just moved into a house with what I am assuming is a Y plan installation. It has a Honeywell 3-Port 40003916-003 valve, with Port B going to the Boiler, and Port A...

Namsag, thanks for the advice. So when you say clock I guess you mean I have to change the whole timer unit? Kirkgas, I could do that but don't have the time right now. I think I am gonna have to order a timer unit and then if it turns out that there was nothing wrong with the old one, well I...