System mismatch: the outdoor and indoor units are not an acceptable combination, or the airflow trim settings are set to a prohibited value.
Goodman d2 flashes for a system mismatch. The outdoor and indoor units are not an acceptable combination, or the airflow trim is set to a prohibited value. Causes are a pair that is not certified, required airflow (CFM) above the indoor unit's maximum, and an indoor unit that is not an EEV type. Both steps belong to a technician or the installer: check the pair on the AHRI site and replace it with a certified combination if it is not one, and confirm the airflow trim was not set to a prohibited value. Code d2 has no filter step and no pressure-switch step.
Likely causes
- Outdoor and indoor units not a certified combination
- Required airflow (CFM) exceeds the indoor unit's maximum
- Connected indoor unit is not an EEV type
Safe checks for d2
- Techniciancheck that the outdoor and indoor units are a certified combination on the AHRI website; if not, replace to a certified combination
- Technicianmake sure the airflow trim settings have not been set to a prohibited value
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician or the installer: d2 points to the equipment pairing or airflow settings.
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