My Eco 80 is once again giving me trouble (curse the previous owner who
had it fitted), it lights, waits 6 or 7 seconds then goes out again,
waits another 30 seconds or so and tries again, same thing, and so on to
infinity I assume. Following the fault finding guide in the manual I
checked the flame sensing electrodes, they seem fine, but I cleaned the
tarnish off just in case, checked the sensor current with a multimeter
and got 4-5uA and the manual says approximately 1uA should be present so
I assume this is ok. The manual then says change PCB, so at enormous
expense I have done that, no difference. I'm at a bit of loss as to
what to do next, my only thoughts are the modulating gas valve, does it
light on a low pressure, and then once its happy it has a flame close
that valve and open another to switch up to a high pressure? Any other
possibilities? I have checked the resistance of the temperature sensor
and it is approximately the 11k the manual dictates.