I've read a lot about issues here to do with the boiler firing when there is apparently no demand and missing RF messages etc., but evohome really does appear to do some odd things sometimes. I'm currently showing 5% demand in my office, it's the only zone showing any kind of demand and yet my boiler just fired for what seemed like less than a minute and the TRV only shows 37% valve position, so not sure if it's even actually open. This happened the other day and the boiler seemed to spend hours short cycling with no heat coming from the rad although it did eventually open the TRV a bit more and I started to feel the rad warm up a little.
I also had similar the other night, there was a small demand from the conservatory and it felt like evohome was doing it's TPI thing, but with the TRVs effectively shut the boiler was just cycling on and off for over an hour until I heard an HR92 open a little more and finally some heat started entering the radiator.
It does seem like there's a bit of a disconnect between when water can actually pass through a TRV and what TPI is doing. I assume it "learns" the characteristics of each zone over time so will know to open a TRV a little more in future if the room doesn't get up to it's set temp within a particular time frame (and/or does it adjust the TPI schedule?) - there seems to be a lot of variables here I guess when multiple zones are calling for heat with different demand levels.
I guess the best thing to do is just not think about it and trust it to do it's thing, but it does annoy me when I heard the boiler fire for no apparent reason!
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I also had similar the other night, there was a small demand from the conservatory and it felt like evohome was doing it's TPI thing, but with the TRVs effectively shut the boiler was just cycling on and off for over an hour until I heard an HR92 open a little more and finally some heat started entering the radiator.
It does seem like there's a bit of a disconnect between when water can actually pass through a TRV and what TPI is doing. I assume it "learns" the characteristics of each zone over time so will know to open a TRV a little more in future if the room doesn't get up to it's set temp within a particular time frame (and/or does it adjust the TPI schedule?) - there seems to be a lot of variables here I guess when multiple zones are calling for heat with different demand levels.
I guess the best thing to do is just not think about it and trust it to do it's thing, but it does annoy me when I heard the boiler fire for no apparent reason!
20210701_101225.jpg
20210701_101300.jpg
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