56 — Fan motor -AD Offset abnormal detection fault

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This fault indicates an abnormal detection in the fan motor's AD Offset. The issue is likely with the control board's circuit.

• Control board circuit failure

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1. 1

   Turn off your air handler at the thermostat and its main electrical breaker for 5 minutes, then turn both back on.

2. 2

   Check the electrical breaker for your air handler. If it's tripped, flip it completely off, then firmly back to the 'On' position.

3. 3

   Inspect and replace your air filter if it's dirty or clogged. A clean filter ensures proper airflow.

4. 4

   Look for any flashing lights or error codes on your air handler or thermostat display and check your manual for their meaning.

5. 5

   If the fault persists, it's best to contact a professional HVAC technician, as the issue may involve internal control board circuits.