My thermostats (ESi ESRTP4) are TPI-capable, but I haven't enabled the setting. The fact the house isn't suffering from huge temperature swings and me having manually lowered the flow temperature has meant the thermostats click off at around SP+0.5C reasonably comfortably right now.
If I've...
Ah thanks for that - I had indeed read that section but clearly hadn't twigged the pump setting was a permanent one; I'd falsely equated it with the other "tests".
Any potential downsides to running the CH pump at 100% all the time, other than increased wear and increased electricity use?
https://idealheating.com/uploads/documents/Logic-Max-Combi-Installation-Servicing-Guide-222362-1_lowres.pdf It was this manual. However, this is for the "Logic Max" and I have just a standard "Logic", so the manual doesn't cover my model.
I think I'm completely SOL when it comes to my system...
As seems to be the growing theme, there's no obvious option to do that on the Ideal's. Unless I need to open it up and flick some kind of switch somewhere... at which point I need a GasSafe engineer as the front panel is head-to-toe room seal.
Given we have no evidence of services, I think it's safe to say any warranty is now gone. I know that'll draw you even closer to there being a fault with the boiler... but on the times were it'd fire for a small amount of time, I did hear the boiler start to modulate back down, so I don't...
Thanks for those workings, as they definitely highlight the issue with oversized combi boilers.
As for the anti-cycle time, it appears this is not changeable on the Ideal boilers so I'm not able to go down that route shy of getting a brand-new boiler.
I'm just over in Liverpool so weather shouldn't be too far from yours. My biggest issue is it being a modern house (timber frame with lots of insulation) - I'm seeing the house lose less than a degree of heat overnight even with external temperatures below 10C. Great for the bills overall, but...
100% because the boiler hits the flow temperature. It seems to vary +/- 5C either side of the set point. For whatever reason, it occasionally fired up, and the flow temperature started rising, but I could hear the boiler modulate back, and the flow temperature then only crept up very slowly...
I sat and measured recently, and the firing time varied from 20-110 seconds with a flow temperature of 50C set. This may change as the winter months roll in as it's still very mild and house temperatures haven't dropped much below 18C.
My thermostats can do TPI but it's off by default from the factory. I've not enabled it, and I'm not sure if I will, though I suppose it gets me a "fake" OpenTherm at the expense of actual heating on/off cycling, with an option for 3 or 6 cycles per hour.
I found the service/install manual for the boiler, and it certainly looks like there's nothing that can be set. Service mode only allows for testing of pump speed and max/min firing rates, with no settings available, so all control looks to be firmly baked into the boiler. Never mind!
I feel...
As far as I can see, the boiler can't fire up on the lowest modulation, and so as the boiler cycles the flame it - very briefly - dumps a lot of energy into the loop. At lower flow temperatures it seems to exceed the set point very, very quickly due to this, hence my thinking the problem will...
Exactly. I'll just make the best of what we have for now, and when the time comes to replace the boiler, I'll get the smallest one we can get away with based on DWH demand.
I'd certainly like to add some kind of proper modulating (flow temperature) controls, but as I mentioned a few posts...
The only answer to this is "ask Persimmon Homes" :) . I imagine they just bought a job lot of this boiler to cover every house in the estate, using the largest demand as the benchmark. The model's heating output range is 7.1-25.6kW depending on temperature (and 35kW output for DHW). All for a...