Originally posted by Kerim
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Wire 1 goes to neutral in.
Wire 2 goes to grinder black wire
Wire 3 goes to thermocoil thermostat black wire
I compared that to an 860, the thermocoil neutral wire is blue and is connected along with the neutrals for the pump and solenoids. I don't know what differences on a board level they made between the 860 and 870 for this. The 860 I'm looking at is very old, if you had a late model 860 they may have already changed some wire colours or connections.
I don't see how any of this would stop your grinder from working though.


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