Lennox · PRODIGY 2.0 Unit Controller
Setting Configuration ID 2, Position 2 to 'C' enables the M3 unit controller to monitor the dirty filter switch (S27). When the filter is dirty, S27 closes, and the controller will display and store an error code.
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Navigate to SETUP > INSTALL > CONFIGURATION ID 2.
Set Position 2 to 'C' to enable the dirty filter switch monitoring.
Save the configuration changes.