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Thanks, I must have a nose bleed, the technology is 80's and uses through hole and bog standard op amps and presets. No indication of function or calibration however. For the 21st century I would expect a microcontroller and SMT devices at least.

The sensors are 3 pin integrated circuits so none of the above ! The temperature measurement still works OK though in that the bar graph shows the right temperature, its just the pump switching which is duff.

I did another post concerning the control box which is an electronic thermostat - you can see the two heat sensors in the photo above. What do you mean by a "strap on thermostat"? The issue's are : 1) There are two pumps, a central heating one (easy), and a boiler pump. I think the...

OK, having had a very useful response to my query on a neutralizer in my dual fuel system I'd like to ask if anyone knows anything about this box? It's the controller which turns on the central heating pump only when the hot water gravity feed gets hot enough, and has two heat sensors, one on...

Well, the item of interest is the silver box under the cylinder not the cylinder itself, and I still think it's expensive ! Thanks to my first reply I now know what it is. It is a "neutralizer" and effectively a water tank with 8 pipes connected in 4 pairs. Two pairs connected to heat sources...

OK, got it, so this box which has puzzled me so much turns out to be an empty metal box with 8 pipes connected in to it and full of water ! And worst of all it costs ~£250 !

Hi all - I have a complex dual fuel system which I am trying to figure out to understand one or two problems with it. Any way I have included a pic of the first confusion which is the heat exchanger. The box sits under the tank. There are two pipes (in and out) on each side of the exchanger...

Heatin Pix