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Thanks to PullarGas, Agas and especially Stem(your reply really helped me). Sorry it has taken me a little bit of time to reply. I have been waiting on the fault condition again. Sods law that it seems to have been working ok. I think you guys are right that it is the limit switch inside the...

Hi guys, I am looking for a bit of advice on my system. I have: an unvented 200l tank being heated from a system boiler via an indirect coil. The boiler is an ideal icos. A danfoss two channel programmer The setup is a standard S plan wired with two zone values (1 HW, 1 HTG) The system is...

All, Right update on the thermal store. So I had x400 in the thermal store for 4 weeks. It made no real difference. I had a heating engineer out today to remove the immersion heater so we could have a look inside the thermal store to confirm that it is the coil that is furred up...

Cowan, I think we are probably in the same estate. Mcdonald Engineers told me the same thing that the coil was probably furred up. They said that they believe the installation of our systems did not include adding inhibitor to the thermal store. I think everyone in the estate will probably...

Dan, I can only thank you for the effort you have put in to record your thermal store operation. I do appreciate it :D :D . Your graphs are nothing like mine and prove how the thermal store should work. Your thermal store looks more like something destined for the ISS space station than...

Thanks Guys. To answer as many of the questions as I can. The tool I used for obtaining the temperature readings was a picolog 12 channel data logger. I used K type thermocouples and attached them to the pipes. As far as I can tell the water is soft. Can't extract the data from scottish...

Great help guys. I appreciate all your time getting to the root of the problem. I think I have now collected all the data. The pump is an Ideal badged Wilo one. Has many numbers on it but HB 15 sticks out. The pump has no speed control on it for me to adjust the speed. Norcon, It...

Guys, Here is the data. I recorded a 10 hour overnight trace and a short 30 minute one. the images have text and a legend on them which explains what was going on. //www.diynot.com/network/thermostorebore/albums/ All these measurements were taken at the pipes entering the...

Dan, its the internal pump version. I only have an external pump on the central heating. Please bear with me for a few days while I collect the data. Simon, I'll have a look to see if there is a speed control switch inside the boiler. C

Thanks Guys. I appreciate all your time trying to guide me in the right direction. I think I will need to get the cover off of the boiler now and start working through your suggestions. snb, Yes I do have the boiler set at maximum. Regarding the flow and return temp measurement. Can I...

thanks Dan, I inherited this system so I didn't really have a choice. From what you said in a previous post. The boiler must have feedback to tell it to go in to cycling off mode. If I reduce the flow temperature thermostat on the front of the boiler, it will go in to this cycling mode...

Follow up to snb questions, Boiler connections into the thermal store are the correct way round and in the correct place. The pipework from boiler to thermal store and from thermal store to CH is 22mm. I also put the pump down to 1 on the CH but the thermal store could still not get...

Dan, sorry I maybe didn't make that clear. The calculator said that I needed a 14.9KW output boiler based upon my house size. My current boiler can output 24KW. I doubt it is consuming this since when it is trying to recharge the thermal store when the CH is on, the blue light it...

Simon d, The system has been commissioned for around 6 years. It has always had this issue. It has various parts changed in the boiler due to them dying. It has had the PCB changed 3 times, the pump changed 4 times and even the main burner (which actually didn't need changed at all)...