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Thanks. We can certainly change the CH flow setting, which will reduce the flow temperature, cause the boiler to run more and improve efficiency. It may come to that in the end. However, we've invested in the vSmart, and we'd rather have it working properly.

You're right, Harry, the manual is a bit vague on certain points. We actually got the advice from Vaillant (RochesterTechnical) directly: "Both hot water and heating settings on the boiler should be set to maximum, as the vSMART is a weather compensator it will aotomaticallyl adjust the boiler...

Hi Fezster. Our boiler's an ecoTec Plus 624 system boiler. As I said in the original post, D.009 shows values from 70° to 85°C. They vary a bit, but they're always very high - probably too high for the boiler to be condensing. The eBus flow temperature doesn't change once the boiler's fired...

Hi Icaraa. I'm interested to read this discussion, as you seem to have a similar issue to us. Did you manage to resolve it? Our vSmart calls for very high flow temperatures whenever it switches on the boiler (eBus temperature request shown at D.009 on the boiler's diagnostics menu). We've never...

I appreciate that. Our issue is that we've bought an expensive system that's designed to take care of that side of things, so we shouldn't be changing things manually. If we reduce the maximum temperature on the boiler, I suspect the vSmart will still call for a much higher temperature via the...

Thanks, Harry. Your heating's obviously doing what ours should be doing!

That's interesting. I've read that the CH temperature on the boiler should be set to the maximum value so that the vSmart has the full range of temperatures to work with. My feeling is that the vSmart is requesting a higher CH flow temperature than it should. Of course, we could reduce the...

We have a modern, thermally efficient house. Last year we replaced our boiler with a Vaillant ecoTec model. Due to compatibility issues with our existing Honeywell room stat we had to replace that too, so we went for Vaillant's vSmart control system. According to the Vaillant advertising (such...

Fluctuating temperatures with faulty vSmart.

vSmart screenshots