Recent content by Ben565

I did get Evohome working in the end, and it has been running for about a year now. My installer point blank refused to fit Opentherm though, not sure why. I think he thought the whole system was a waste of time and money, and to be honest it's questionable whether it's wholly compatible with my...

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Yeh sorry wasn't the best picture

They are this type, don't know if they are good ones or not.

Its going to be hard to do any more because its working normally now. Which is what makes me think something mechanical was stuck/sticking. And zone valves are prime candidate for this.

It is connected up as a basic S-Plan system, just switched live for the zone valve is coming from a BDR91 instead of a thermostat or controller box. Theres no difference. I could disconnect the BDR91 and put a manual switch to the zone valve, but what would that prove ? We already know BDR91...

Yes there's a few different configurations possible. In my setup BDR91 is controlling the zone valves. I have one for HW and one for CH. My installer said it makes no difference if BDR91 triggers the boiler directly. Or triggers it via a zone valve. Personally I would have configured it so...

I don't think its an evohome problem. That part is operating correctly, and it's been working fine for some months now it isn't a new installation. As you said, bdr91 is operating the valve via the pink wire and both valves are operating when requested, as normal. Just that the boiler isn't...

Yes there is some clever box of tricks involved here. I have an Evohome system, the zone valves are controlled by BDR91, that part of it seems to be working in so much as they are activating the zones valves when required. Looking at it, the pink(ish) wire appears to be switched live to the...

With a multimeter, on ohms setting. System powered off and manually opening closing the valve to check function of the microswitch.

As I understand it, the grey and orange is just connected to a microswitch inside the valve. The other end goes to the boiler and thats what tells it to fire. Either CH or HW could be open or closed. Or both open, or both closed. Testing with a multimeter shows the HW microswitch is closing...

I've looking at the grey, orange, and pink to my zone valves. So if there is a demand for HW the HW zone valve opens but the boiler will not fire unless grey, orange, and pink are disconnected from the CH valve. I havent tried disconnecting the mains power to the valve.

S plan sorry yes, my mistake, with a vented system. **edited the original post now to correct

Its a viessmann vitodens 100 boiler by the way.

OK bit of an odd one (for me at least) I have a S plan system with hot water cylinder. Neither HW or CH is coming on, the thermostat/hot water call for heat, the relevant zone valve activates.... and then nothing happens. Pump doesn't come on, boiler doesn't fire. Weirdly though, if I...