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Firstly, apologies for the double-post - broadband playing up I think, so connections were dodgy (sounds like my wiring :wink: ) I'm a bit doubtful it's the programmer, purely because everything was working okay prior to me doing my stuff. I will try and find the multimeter - if that's what...

Very much appreciate your inputs, DBP and Matt1e. I've slightly led you astray with the photo, as I would have secured the long wires into the CH terminals under the clamp but as it's a work in progress/testing situation, that hasn't yet been done. Having said that, I would not have had the nous...

Very much appreciate your inputs, DBP and Matt1e. I've slightly led you astray with the photo, as I would have secured the long wires into the CH terminals under the clamp but as it's a work in progress/testing situation, that hasn't yet been done. Having said that, I would not have had the nous...

Here are two views of the JB - the second one shows the wires coming in a bit better. Any views, anyone? Do my connections to the HW and CH terminals look correct? [img]

Honeywell junction box for heating/hw 10/04/2012

Well Paul, good question but the valves themselves were definitely knackered (very rusted up) and one of the actuators definitely had given up the ghost. The other is probably still all right but while I was changing so much (the circ pump had gone too, along with the gate valves either side...

Right, I'll get a photo organised and post it. Some might say my 'purple' is blue but it's a very purplish-blue. Surely not an earth - even an amateur like me can recognise the green-and-yellow. The junction box is a Honeywell, white plastic rectangular (horizontal orientation) about 6 inches...

Thanks for the reassurance Spacecat. I've now tried swapping the HW actuator with a spare one and still no orange light - so I'm thinking maybe I made a mistake when noting down how to wire in the new actuator. My notes say the wires should go into the junction box as follows (moving down in...

Hmmm, now you come to mention it .... Not really sure. It's a fairly new Siemens RAM1 stat which replaced the old Potterton one. Presumably it was working before this project happened, as the old MV was functioning after a fashion (with a bit of persuasion at times) and we did have hot water...

Think I know where to find one of those ..... :)

Hi all, Just had to replace both Potterton two-port MVs and Grundfos circulating pump in my quite old indirect system and while the central heating side of things is working, the hot water valve is not coming on at all when switched on at the programmer. The little orange light on top is not...

Water is flowing fine to the taps, toilets and water tanks in the loft when the pump is switched on. The pump just won't stop running/pumping, even when there's no demand. It is a direct replacement for an old Grundfos Jetpaq pump which blew up and was plumbed in in exactly the same way -...

Well excuse my ignorance. I thought my previous thread was done and dusted so I should start a new one. I thought this site was for getting help, not for being criticised. If you don't like the way I post, don't reply, thanks all the same. B.

Hi all, The saga of my Grundfos MQ 3-45 continues. Having sorted how and where to put the non-return valve (see previous post) the pump now won't stop running, even when there's nothing pulling water. The instructions say it will do this if there's no non-return valve or it's faulty or...

Yep, used the pause button on the video to good efect and the pointy end goes into the pump. The chap on the video actually dropped the other end (shaped like a cross if you look at it end-on) into the plastic screw-on bit from the pump, then fitted that to the pump and screwed the whole thing...

Well, don't know whether to feel elated or stupid. I went on the Grundfos website and delved into their servicing videos - and found this: http://net.grundfos.com/Appl/WebCAPS/LiteratureDetail?documentid=20596&language=USA For those of you who don't want to be bothered going there, it's a...

Ah well, I think it needs an email to Grundfos and hope one of their techs can enlighten me. Thanks for your replies anyway doitall.

For input port read inlet port. I've uploaded a couple of pics to an album called MQ 3-45 valve but I this is them here: In the booklet it says: "A non-return valve is supplied with the pump. It is recommended to fit this non-return valve in the pump suction port". That's all it...