Lennox · PRODIGY 2.0 Unit Controller
Setting Configuration ID 2, Position 4 to either '2' (for DI-2) or '3' (for DI-3) enables the M3 unit controller to monitor the blower overload relay switch (S42). This monitors current flow to the blower motor.
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Navigate to SETUP > INSTALL > CONFIGURATION ID 2.
Set Position 4 to '2' or '3' based on the wiring to DI-2 or DI-3.
Save the configuration changes.