The harvest light goes off when the sensor is unplugged. The light is off for the 6 min freeze lock period, or 3-5 min if freeze lock is bypassed, then the harvest light comes on. It will stay on if the sensor is raised or moved away form the grid.
I watched the water flow very closely and witnessed no water coming into direct contact with the probe. The probe did get an occasional small splash from the water breaking on the adjustment screw but it has to be a constant 10 sec reading before the board decides it's a good measurement. And it still does it when dried off.
A ground path through my body would be minute. If it's functioning correctly, that would indicate to me that the amount of ground the board is watching for is also minute. That would seem too sensitive to me. When previously malfunctioning I could just hold the probe assmy by the plastic of the probe and it would sense harvest.
The probe was purchased from the local Manitowoc dealer and appears to be the exact same as the original one. It also worked without issues for several months after being changed.
I know the symptoms point to the probe but it's hard to believe that it's bad again. Especially considering how simply made it is. I don't think the wire from the probe is a resistor wire ( I checked it for resistance and got infinity ) and, so far as I can tell, the probe it self is just the metal plate attached to the wire.
Honestly I can't see how the probe could ever go bad unless the plastic cracked or the wire came off the stainless strip. Not sensing correctly because of being dirty would make sense - but it's clean.
I'm thinking that with these symptoms and a correctly working board it would be the probe. But what if the board is reading a less than required - very low amount of ground as enough to indicate that the ice is the correct thickness?
I am going back today to check ground. I'm also wondering if voltage leaking to ground somewhere in the building might screw up the ground reading to the board.
25 Years in the biz. 9 years LG authorized.