Frist of all, whoever you are thank you so very, very much for continuously trying to help, to find solution, to understand what is really going on also by asking the ground questions - you have lots of patience
Good idea I will call Dimplex, but if someone comes to your mind, please do let me know, I live in Oxfordshire.
Ok so starting from the last bit - people in the apartments around, just try to put up with them not working, or partially working, for some they are working ok, it seems nobody called an electrician yet or maybe if they did it was unsuccessful or maybe someone was told they would have to replace them and that is very expensive - nobody has suggested any electrician though I asked.
The heating is set up as follows:
1st heater the one that works, the background is set up for the 8th bar so it would be 7th red bar but as per the instructions you provided the link to, this blue light/bar should also be counted in), the comfort zone is on a blue light = the 1st bar . It produces a lot of heat from the night storage, till very late in the afternoon and sometimes even evening, so no point to have comfort zone on anything more than this blue light. This background and the comfort zone where like this when I took over the flat, I did not change it and it works perfectly
As I understand/think all other heaters should work as this one: accumulate enough heat overnight to share it during the day. Turning the comfort zone on, would only really be necessary in extra freezing temperatures if the storage heat would not be enough to heat up the place. Am I correct? Because, as per the instructions you have provided it seems for both the normal and the high setting the comfort zone should be on the 5th bar constantly? It does not make a sense for me as what is the point for using the comfort zone if the background zone provides the heat? Plus there is an electricity day charge for a comfort zone. I am a bit confused about it now. Anyway back to the heaters.
The 2nd heater is broke so will leave it.
The 3rd heater, the background (when I 1st checked it) was initially somewhere in the middle more or less (for sure more than 4 red bars). However, as it was not working a neighbour suggested turning it to max, to help it kick start it, just for the night. I did it but it did not work. Now the background is on the 9th bar. The comfort zone is on 1st = on a blue light.
The 4th heater, the background ( again when I 1st checked it) was initially somewhere in the middle more or less (again more than 4 bars). However, the same story as it was not working a neighbour suggested turning it to max, to help it kick start it, just for the night. I did it but it did not work. Now the background is on the 10th bar so it is max. The comfort zone is on 1st = on a blue light.
The 5th heater, the background ( again when I 1st checked it) was initially somewhere in the middle more (more than 4 red bars) or less. However, the same story as it was not working a neighbour suggested turning it to max, to help it kick start it, just for the night. I did it but it did not work. Now the background is on the 9th bar so it is max. The comfort zone is on 1st = on a blue light.
I have 3 switches on the wall for each of them. Also the instructions I have are slightly older than yours. As those heaters have been operating supposively for years, it does say in my instructions that I can adjust temperature by adding or removing one red light.
Would you say I should change those settings now? Again a bit confused about this comfort zone now, if heater no 1 works perfectly when comofor zone is on blue.