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I had an electrician around doing some work in my garage at the time of me fitting my programmer so I asked him for some advice and he was pretty clueless. I don't expect that they're all like that of course but I'm glad I was able to do it myself, for free, and properly.

Okay I will just have to wait and see. When on my next day off I'll ensure I keep the programmer in the same room, with the temperature set the same, and keep external door opening to a minimum and I'll see if it does indeed fire every single 20 minutes. I would expect that getting into the...

Well this was something I was alluding to earlier, what determines whether it fires at all or not? From my experience with it even after nearly a full day it still fires on each and every 20 minute point. I believe you :D

I hear what you're saying but the thing that makes it much less convincing for me is that after changing the cycle rate from 6/hr to 3/hr there are still occurances of these empty cycles, that simply says to me that 6/hr was clearly too much. Also I don't believe that the boiler firing, but only...

Hi Jonny, I recently fitted a CM927 to my house but it's the only heating job I've done so I'm no expert. I was replacing a programmer which was battery powered and literally only acted as a switch to turn the boiler on and off. It was essentially a clever roomstat so you should be able to...

Yep I think you're probably right there. I think it's going to pretty impossible to determine an accurate figure other than spending a week or so using this programmer and then another week using a normal thermostat. At that would then rely on those two weeks having the same weather and the...

I use the term 'cycle' because this is the term used in the installer guide. The default Pb is 1.5 and it can be increased to 3 in 0.1 steps, but doing this would make my problem worse if I understand it right. I am positive about the concept, I've done some work on control techniques...

Aha I hadn't seen there was a second page... When I meant was how much higher than the target temperature does the room need to be at to stop the programmer from cycling? I could test this myself but I'm not at home for a week now. And is this temperature adjusted by the proportional...

The temperature it's reading is right so there's no need to. Even if there was, adjusting the offset wouldn't affect my problem, it would simply occur at a different temperature.

If you read the line that's just after that one it says: Not sure what's confused you there. Yes.

Thank you very much for that reply Mathew. I fully appreciate where you're coming from and I understand that the system is designed to avoid the input-output lag but you've given me a better understanding so thank you. It's clear that there will be a limit at which the programmer will skip a...

Coarse?! It is still firing when the room temperature is HIGHER than the required temperature. Coarseness had absolutely no bearing on my problem. I don't know what you mean by boiler thermostat, I'm not a heating engineer. All I can tell you is the relay clicks on, the boiler fires, the...

Okay I found a useful site that explains things a little: http://www.homexpertbyhoneywell.com/en-DE/Support/FAQs/Pages/default.aspx This is what it says: It does make sense and I can understand that thinking, but still I'm not convinced that my boiler switching on when the room...

Thanks for that, not sure what made you think this was a necessary inclusion to your reply though. Highlighted deficiencies may have been passed up but we may just not be aware of them. Personally I don't really want my boiler kicking in every 10 minutes (as is the default) when it takes...

42 views and no replies! Anyone?

I recently fitted a CM927 programmer into my house with a BDR91 relay box. I quickly noticed that the boiler seemed to be firing very often. I looked at the installer guide and, as I'm sure you're all aware, it's designed to fire up a certain number of cycles an hour so this is normal. The...