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Thanks for your help, I think I have sussed it. What I did originally was wire the live to the programmer and thermostat direct from the mains. The "switch" from the valves to activate the boiler, ie when they are calling for heat, was then working from that direct mains feed too. What the...

Thanks everyone. It's a Vaillant Eco Tec Plus 824 R1 Serial 210703308520 There are no links on the 24v side Like I said it was working fine but now I seem to be getting a voltage from terminal 4 with nothing connected to 3 or 4. My understanding is that terminal 3 should be live and then 4...

Rob, sorry, will check as soon as I can and get back to you. Thanks.

It's a Vaillant 824 combi. I have attached a hot water tank for flexibility around bathrooms etc so there are two valves, one for heating and one for hot water. As I said it was working fine then I noticed that it was trying to heat although the programmer was not telling it to come on. I looked...

230v is my understanding. I wired terminal 4 in the boiler to the orange wires coming from the two two port valves. My understanding is that the programmer activates either the central heating or the hot water valve. When the valve opens this triggers a switch in the valve which makes the...

It's a Drayton MiTime 721R It's not the programmer at fault I don't think. Like I say, 3 and 4 act as the switch to activate the boiler. 3 is live out and 4 is the switched return, I think! With the programmer disconnected from the boiler 3 and 4 are both showing as live without being...

Thanks. No, I removed the link. My understanding is to remove this across 3 and 4 when using external controls. When I say control box I mean programmer. With a tester linked to neutral I am getting a live reading off 3 and 4.

Hi there. I am new to this forum, I am hoping someone can help. I recently wired a control box to my 824 combi. Everything was fine initially. A week or so later the boiler keeps wanting to fire even though the control box is not telling it to. When I wired it up I connected the switched live...