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What do these mean?
Sensor
Normal — the sensor is reporting. Not reading — nothing has come in for a while. Contact K&H and we'll sort it out.
Filter
Learning — the sensor is still working out what a clean filter looks like on your system. It needs about a day of heating or cooling. Nothing is wrong.
Good — no action needed. Change now — the filter is restricting airflow enough to be worth replacing.
Filter index
How hard the blower is working to pull air through the filter. It starts near your system's clean number and climbs as the filter loads. The raw pressure reading in inches of water column is underneath it.
After you change a filter
Tap I put in a new filter. That tells the sensor to re-learn from the fresh filter. It takes two taps on purpose, so it can't happen by accident.