Standard Radiator.
I have just removed the thermostat as I think it was confusing the controller. Also made it hard to bleed the system when the thermostat is closed. Also I noticed that when the fan LED was on during the over run, the fan wasn't on. After much testing I found the output to the fan relay was an earth, not a positive signal. Now the fan works, although the temp never went high enough to warrant the fan to come on.
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