Horsepower conflict on the memory card. The motor's horsepower does not match the card, but the model data in the furnace control does match the motor. This is a non-critical fault, shown in standby.
Likely causes
- Blower motor was replaced with the wrong horsepower
- Memory card or furnace control was replaced with the wrong part
How to fix d6: safe DIY steps
- If the furnace is running and d6 appears only in standby, the manual says operation should proceed as normal
- Techniciandetermine the correct motor and model-data card and replace the incorrect part. The manual says the original card must be used when it is available, and a card from another furnace can damage the heat exchanger
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician before anyone replaces the blower motor or the memory card. d6 is a parts-match fault, not a lockout.
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Parts & tools for this fix
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Furnace blower (circulator) motor: guide
In this code: Blower motor was replaced with the wrong horsepower
This one is for a technician to test or replace, so we only explain it and do not link to buy it.